Course outline
Module 1
Module 1: What Is Sleep and Why Do We Need It?
What Is Sleep and Why Do We Need It?
Knowledge check
Q1. Which stage of sleep is most closely associated with vivid dreaming and rapid eye movements?
- A. Stage N1 (light sleep)
- B. Stage N2 (light sleep with sleep spindles)
- C. Stage N3 (deep slow-wave sleep)
- D. REM sleep ✓
Why: REM (rapid eye movement) sleep is the stage in which vivid dreaming most often occurs and during which the eyes move rapidly beneath closed lids. Brain activity during REM resembles waking activity, while muscles are largely paralyzed.
Q2. Approximately how many complete sleep cycles does a typical adult go through in a night?
- A. 1 to 2 cycles
- B. 3 to 6 cycles ✓
- C. 10 to 12 cycles
- D. Over 20 cycles
Why: A typical adult completes about 4 to 6 sleep cycles per night, each lasting roughly 90 to 110 minutes. Each cycle moves through non-REM stages and then REM sleep.
Q3. Which of the following is a primary function of deep slow-wave sleep (Stage N3)?
- A. Consolidating emotional memories only
- B. Physical restoration, tissue repair, and release of growth hormone ✓
- C. Increasing body temperature for wakefulness
- D. Suppressing the immune system
Why: Deep slow-wave sleep is associated with physical restoration, tissue repair, and the release of growth hormone. It is the most restorative stage for the body, while other stages contribute more to cognitive and emotional processing.
Q4. What is the body's internal timing system that regulates the sleep-wake cycle over roughly 24 hours called?
- A. Homeostatic drive
- B. The circadian rhythm ✓
- C. The ultradian rhythm
- D. The glymphatic cycle
Why: The circadian rhythm is the roughly 24-hour internal clock that regulates sleep and wakefulness, along with many other physiological processes. It is influenced largely by light exposure and is located in the suprachiasmatic nucleus of the hypothalamus.
Q5. Which process describes the increasing sleep pressure that builds the longer you stay awake?
- A. Circadian alignment
- B. REM rebound
- C. Homeostatic sleep drive ✓
- D. Sleep inertia
Why: Homeostatic sleep drive is the buildup of sleep pressure during wakefulness, driven partly by the accumulation of adenosine in the brain. This pressure dissipates during sleep, which is why longer waking periods lead to a stronger need for sleep.
Module 2
Module 2: Sleep Stages and the Sleep Cycle
Sleep Stages and the Sleep Cycle
Knowledge check
Q1. Which sleep stage is characterized by slow, rolling eye movements and the transition from wakefulness into sleep?
- A. Stage N1 (light sleep) ✓
- B. Stage N2 (light sleep with sleep spindles)
- C. Stage N3 (deep slow-wave sleep)
- D. REM sleep
Why: Stage N1 is the lightest stage of non-REM sleep and marks the transition from wakefulness to sleep. It is characterized by slow rolling eye movements and a reduction in muscle activity, and it typically lasts only a few minutes.
Q2. What are sleep spindles and K-complexes primarily associated with?
- A. Stage N1 sleep
- B. Stage N2 sleep ✓
- C. Stage N3 sleep
- D. REM sleep
Why: Sleep spindles and K-complexes are EEG hallmarks of Stage N2 sleep. They help stabilize sleep and reduce sensitivity to external stimuli, and they are thought to play a role in memory consolidation.
Q3. Which stage of sleep is also known as slow-wave sleep and is associated with the greatest difficulty in arousing a person?
- A. Stage N1
- B. Stage N2
- C. Stage N3 ✓
- D. REM sleep
Why: Stage N3 is called slow-wave sleep because it shows high-amplitude, low-frequency delta waves on EEG. It is the deepest stage of non-REM sleep, and people are hardest to awaken from it. It is important for physical restoration.
Q4. During which sleep stage do most vivid dreams typically occur, and muscle atonia is most pronounced?
- A. Stage N1
- B. Stage N2
- C. Stage N3
- D. REM sleep ✓
Why: REM (rapid eye movement) sleep is when most vivid dreaming occurs. The brain is highly active, resembling wakefulness on EEG, while the body experiences muscle atonia, which prevents acting out dreams.
Q5. Approximately how long does a typical complete sleep cycle last in adults?
- A. About 30 to 45 minutes
- B. About 90 to 110 minutes ✓
- C. About 3 to 4 hours
- D. About 24 hours
Why: A typical adult sleep cycle lasts roughly 90 to 110 minutes, moving through N1, N2, N3, and then REM. Over a night, a person usually cycles four to six times, with REM periods lengthening toward morning.
Module 3
Module 3: Insomnia: Causes and Management
Insomnia: Causes and Management
Knowledge check
Q1. Which of the following best describes insomnia?
- A. Sleeping more than nine hours per night consistently
- B. Persistent difficulty falling asleep, staying asleep, or waking too early, despite adequate opportunity to sleep, with daytime impairment
- C. Occasional nightmares that wake a person during the night
- D. Feeling sleepy during the day after a normal night's sleep
Q2. Which of the following is a common perpetuating factor for chronic insomnia?
- A. Regular exercise in the morning
- B. Consistent wake times across the week
- C. Spending extended time in bed trying to force sleep, leading to conditioned wakefulness
- D. Keeping a regular bedtime routine
Q3. What is the first-line recommended treatment for chronic insomnia in adults?
- A. Long-term use of benzodiazepines
- B. Daily alcohol consumption before bed
- C. Cognitive behavioral therapy for insomnia (CBT-I)
- D. Heavy evening meals to promote drowsiness
Q4. Which of the following is a core component of sleep hygiene advice?
- A. Using screens in bed until falling asleep
- B. Napping for several hours in the late afternoon
- C. Keeping the bedroom cool, dark, and quiet
- D. Drinking large amounts of caffeinated beverages after dinner
Q5. Stimulus control therapy for insomnia is based on which principle?
- A. Lying in bed until you feel tired, even if awake for hours
- B. Using the bed only for sleep and sex, and getting up if unable to sleep after about 20 minutes
- C. Watching television in bed to relax before sleep
- D. Staying in bed as long as possible to increase total sleep time
Module 4
Module 4: Sleep-Disordered Breathing and Sleep Apnoea
Sleep-Disordered Breathing and Sleep Apnoea
Knowledge check
Q1. What is the defining feature of obstructive sleep apnoea (OSA)?
- A. Absence of respiratory effort during sleep due to brain signalling failure
- B. Repeated collapse of the upper airway during sleep, causing partial or complete blockage of airflow ✓
- C. Progressive daytime hypoventilation caused by chest wall weakness
- D. Irregular breathing caused by high altitude exposure
Why: Obstructive sleep apnoea is caused by repeated collapse of the upper airway, typically at the soft palate, tongue base or pharynx, during sleep. This produces reductions (hypopnoea) or cessations (apnoea) of airflow despite ongoing breathing effort, often leading to oxygen desaturation and arousals.
Q2. Which of the following is the most common symptom reported by people with sleep apnoea?
- A. Loud, habitual snoring with witnessed breathing pauses ✓
- B. Chronic cough with wheezing
- C. Sudden waking with a feeling of suffocation only during dreams
- D. Night sweats without any breathing changes
Why: Habitual loud snoring, often with witnessed pauses in breathing followed by gasping or snorting, is the hallmark symptom of obstructive sleep apnoea. Excessive daytime sleepiness is also common, but snoring with witnessed apnoeas is the most typical presenting complaint.
Q3. What does the Apnoea-Hypopnoea Index (AHI) measure?
- A. The average oxygen level throughout the night
- B. The number of apnoeas and hypopnoeas per hour of sleep ✓
- C. The total duration of REM sleep
- D. The heart rate variability during sleep
Why: The Apnoea-Hypopnoea Index counts the number of apnoea (complete airflow cessation) and hypopnoea (partial airflow reduction) events per hour of sleep. It is used to grade severity, with mild, moderate and severe categories typically defined as roughly 5-15, 15-30 and over 30 events per hour.
Q4. Which risk factor is most strongly associated with the development of obstructive sleep apnoea?
- A. Being a regular daytime napper
- B. Having a high body mass index (obesity) ✓
- C. Drinking tea in the evening
- D. Sleeping on a firm mattress
Why: Obesity, particularly excess fat around the neck and upper airway, is one of the strongest risk factors for obstructive sleep apnoea. Increased soft tissue narrows the airway and makes it more prone to collapse during sleep. Other risk factors include male sex, age, large neck circumference and alcohol use before bed.
Q5. What is the first-line, most widely used treatment for moderate to severe obstructive sleep apnoea?
- A. Sleeping pills to deepen sleep
- B. Continuous positive airway pressure (CPAP) therapy ✓
- C. Daily oral antihistamines
- D. Long-term oxygen therapy alone
Why: Continuous positive airway pressure (CPAP) delivers a constant stream of pressurised air through a mask, which acts as a pneumatic splint to keep the upper airway open during sleep. It is the first-line and most effective treatment for moderate to severe obstructive sleep apnoea, though adherence can be a challenge.
Module 5
Module 5: Restless Legs Syndrome and Movement Disorders
Restless Legs Syndrome and Movement Disorders
Knowledge check
Q1. Which of the following is a core diagnostic criterion for Restless Legs Syndrome (RLS)?
- A. Leg pain that is relieved by walking
- B. An urge to move the legs, usually accompanied by uncomfortable sensations, that worsens during rest ✓
- C. Involuntary jerking of the legs that occurs only during wakefulness
- D. Swelling and redness of the lower legs in the evening
Why: RLS is diagnosed when a person has an urge to move the legs, often with uncomfortable or unpleasant sensations, that begins or worsens during rest or inactivity and is at least partially relieved by movement. Leg pain relieved by walking suggests a vascular or other cause, while swelling and redness point to different conditions.
Q2. What is the typical time of day when symptoms of Restless Legs Syndrome are most noticeable?
- A. Early morning, shortly after waking
- B. Midday, during periods of physical exertion
- C. Evening and night, especially when lying down or sitting still ✓
- D. Only immediately after a meal
Why: RLS symptoms typically worsen in the evening and at night, when a person is resting, sitting, or lying down. This circadian pattern is a key feature that helps distinguish RLS from other causes of leg discomfort.
Q3. Periodic Limb Movement Disorder (PLMD) is best described as:
- A. Repetitive leg jerking or twitching during sleep that may disrupt sleep ✓
- B. A daytime condition causing muscle weakness in the legs
- C. A form of epilepsy affecting the lower limbs
- D. Chronic cramping of the calf muscles during exercise
Why: PLMD involves repetitive, stereotyped limb movements, most often of the legs, occurring during sleep, typically every 20 to 40 seconds. These movements can cause micro-arousals and fragmented sleep, and they frequently co-occur with RLS.
Q4. Which of the following is a commonly recognized factor that can worsen Restless Legs Syndrome symptoms?
- A. Regular moderate aerobic exercise earlier in the day
- B. Iron deficiency and low ferritin levels ✓
- C. Taking a warm bath before bedtime
- D. Consistent sleep and wake times
Why: Iron deficiency, particularly low brain iron and low serum ferritin, is strongly associated with RLS and can worsen symptoms. Checking iron status is an important part of evaluating someone with suspected RLS.
Q5. A first-line non-medication approach often recommended to help manage mild Restless Legs Syndrome symptoms is:
- A. Avoiding all physical activity for the entire day
- B. Drinking large amounts of caffeinated beverages in the evening
- C. Practicing regular exercise, leg massage, and avoiding caffeine and alcohol ✓
- D. Sleeping with the legs tightly wrapped in blankets
Why: Lifestyle measures such as regular exercise, leg massage, warm baths, and avoiding caffeine and alcohol are commonly recommended first steps for mild RLS. Caffeine and alcohol can worsen symptoms, while regular activity and gentle leg stimulation often provide relief.
Module 6
Module 6: Circadian Rhythm Disorders
Circadian Rhythm Disorders
Knowledge check
Q1. What is the approximate length of the endogenous human circadian rhythm?
- A. 12 hours
- B. About 24 hours ✓
- C. About 30 hours
- D. About 48 hours
Why: The human circadian clock runs on a cycle of roughly 24 hours (typically slightly longer than 24 hours in the absence of external cues), which is why it must be reset daily by light exposure and other time cues called zeitgebers.
Q2. Which structure in the brain is considered the master circadian pacemaker?
- A. Pineal gland
- B. Hippocampus
- C. Suprachiasmatic nucleus ✓
- D. Thalamus
Why: The suprachiasmatic nucleus (SCN) of the hypothalamus is the master circadian pacemaker. It receives light information from the retina and coordinates rhythms throughout the body, including sleep-wake timing.
Q3. What is the primary environmental cue (zeitgeber) that synchronizes the human circadian clock?
- A. Temperature
- B. Light exposure ✓
- C. Noise levels
- D. Meal size
Why: Light is the most powerful zeitgeber for the human circadian system. Light detected by specialized retinal cells signals the SCN, which adjusts the timing of the clock, particularly through morning and evening light exposure.
Q4. Delayed Sleep-Wake Phase Disorder is characterized by which pattern?
- A. Falling asleep and waking up much earlier than desired
- B. Falling asleep very late and having difficulty waking at conventional times ✓
- C. Sleeping in fragmented periods across the 24-hour day
- D. Excessive sleepiness during the daytime with normal nighttime sleep
Why: Delayed Sleep-Wake Phase Disorder involves a persistent delay in the timing of the major sleep period, so the individual falls asleep late (often 2 AM or later) and has marked difficulty waking at socially required times, despite normal sleep quality once asleep.
Q5. Which circadian rhythm disorder is most commonly seen in older adults and involves sleepiness and waking very early in the evening and morning?
- A. Shift Work Disorder
- B. Jet Lag Disorder
- C. Advanced Sleep-Wake Phase Disorder ✓
- D. Irregular Sleep-Wake Rhythm Disorder
Why: Advanced Sleep-Wake Phase Disorder involves an earlier-than-normal timing of sleep onset and wake time, with individuals feeling sleepy in the early evening and waking very early in the morning. It becomes more common with age.
Module 7
Module 7: Parasomnias and Other Sleep Disturbances
Parasomnias and Other Sleep Disturbances
Knowledge check
Q1. Which parasomnia is characterized by an individual sitting up, moving about, and sometimes walking during slow-wave sleep, typically in the first third of the night?
- A. REM sleep behavior disorder
- B. Sleepwalking (somnambulism) ✓
- C. Sleep terrors
- D. Bruxism
Why: Sleepwalking occurs during deep non-REM (slow-wave) sleep, most often in the first third of the night, and involves complex motor behaviors while the person remains unresponsive and typically has no memory of the episode.
Q2. Vivid dreams with dream-enacting behaviors such as punching or kicking, occurring during REM sleep, are the hallmark of which disorder?
- A. Narcolepsy
- B. Restless legs syndrome
- C. REM sleep behavior disorder ✓
- D. Nightmare disorder
Why: REM sleep behavior disorder results from loss of the normal muscle atonia that accompanies REM sleep, allowing patients to act out their dreams. It is strongly associated with later development of synucleinopathies such as Parkinson disease.
Q3. Sleep terrors differ from nightmares primarily in that sleep terrors:
- A. Occur mainly during the final hours of sleep in REM stage
- B. Involve intense fear with screaming and autonomic arousal, usually during non-REM sleep, with little or no recall of dream content ✓
- C. Are always caused by alcohol withdrawal
- D. Can be recalled in vivid detail the next morning
Why: Sleep terrors arise from deep non-REM sleep in the first part of the night and involve sudden arousal with screaming, intense fear, and autonomic signs, with the person usually unable to recall a dream. Nightmares occur in REM sleep later in the night and are recalled in detail.
Q4. What is the recommended first-line approach for most children who experience bedwetting (enuresis) without an underlying medical cause?
- A. Immediate long-term stimulant medication
- B. Behavioral strategies such as bladder training, fluid timing, and alarm therapy ✓
- C. Surgical correction of the bladder
- D. Daily sedative hypnotics
Why: Enuresis is commonly managed first with behavioral interventions, and alarm therapy is considered one of the most effective options. Medications and surgery are reserved for cases that do not respond or have specific medical indications.
Q5. Teeth grinding and jaw clenching during sleep is known as:
- A. Sleep bruxism ✓
- B. Hypnagogic jerk
- C. Catathrenia
- D. Exploding head syndrome
Why: Sleep bruxism is the involuntary grinding or clenching of teeth during sleep, often occurring during light non-REM sleep and arousals. It can cause tooth wear, jaw pain, and headaches, and is frequently treated with occlusal splints.