Sleep and mental health

• A. To stop producing new cells entirely
• B. To consolidate memories and allow the brain to clear metabolic waste ✓
• C. To reduce the body's need for food and water
• D. To increase body temperature to fight infection during the day

Why: During sleep, the brain consolidates learning and memories and the glymphatic system helps clear metabolic waste products that build up during waking hours.

• A. 4 to 5 hours
• B. 5 to 6 hours
• C. 7 to 9 hours ✓
• D. 10 to 12 hours

Why: Major sleep health organizations recommend that most adults get 7 to 9 hours of sleep per night for optimal health and functioning.

• A. Sleep deprivation has no measurable effect on mood or emotional regulation
• B. Sleep deprivation only affects physical strength, not mental states
• C. Chronic poor sleep is linked to higher risk of anxiety and depression ✓
• D. Sleep deprivation improves focus and reduces stress over time

Why: Research consistently links chronic insufficient or poor-quality sleep with increased risk of anxiety and depression, and with greater emotional reactivity.

• A. The digestive system only
• B. The circadian rhythm, which governs hormone release and body temperature ✓
• C. The skeletal system
• D. The respiratory system during waking hours only

Why: The circadian rhythm, driven largely by the suprachiasmatic nucleus in the brain, coordinates timing of hormone release such as melatonin and cortisol as well as body temperature and other processes.

• A. Sleep weakens immune responses so the body can rest
• B. Sleep has no connection to immune function
• C. Adequate sleep supports immune function, while lack of sleep can impair the body's response to infection ✓
• D. Immune function is only affected by diet, not sleep

Why: Good sleep supports the production and activity of immune cells and proteins, and insufficient sleep has been associated with reduced ability to fight off infections.

• A. 30 minutes
• B. 90 minutes ✓
• C. 3 hours
• D. 6 hours

Why: A typical adult sleep cycle lasts about 90 minutes and moves through non-REM stages followed by a REM stage. Most adults go through roughly four to six cycles in a night.

• A. Stage N1 (light sleep)
• B. Stage N2 (light sleep)
• C. Stage N3 (deep sleep)
• D. REM sleep ✓

Why: REM (rapid eye movement) sleep is when the brain is highly active and most vivid dreams occur. Muscle tone is also temporarily suppressed during this stage.

• A. Stage N1
• B. Stage N2
• C. Stage N3 (slow-wave sleep) ✓
• D. REM sleep

Why: Stage N3, also called slow-wave or deep sleep, is characterized by large, slow brain waves. Waking someone from this stage is difficult, and they may feel groggy afterward.

• A. Deep sleep increases and REM sleep decreases
• B. Both increase steadily
• C. Deep sleep decreases and REM sleep increases ✓
• D. Both decrease steadily

Why: Deep sleep is concentrated in the first half of the night, while REM periods grow longer toward morning. This is why people often remember dreams more when they wake in the early morning.

• A. It only affects physical energy levels
• B. It has no measurable link to mood or emotion
• C. Healthy cycling supports emotional regulation and memory consolidation ✓
• D. It only matters for children, not adults

Why: Proper progression through sleep stages, especially REM and deep sleep, helps process emotions and consolidate memories. Disrupted cycles are linked to anxiety, depression, and poor mood regulation.

• A. Poor sleep has no effect on mood once a person is awake
• B. Sleep disturbances can increase the risk of depression, and depression can disrupt sleep ✓
• C. Depression always causes people to sleep too little
• D. Sleep problems only occur after mood disorders are fully resolved

Why: Sleep and mood disorders influence each other in both directions. Insomnia and other sleep disturbances can raise the risk of developing depression, while depression commonly causes changes in sleep such as insomnia, early morning waking, or hypersomnia.

• A. Consistently sleeping 7 to 8 hours each night
• B. Early morning awakening with difficulty returning to sleep ✓
• C. Falling asleep within two minutes of lying down
• D. Waking feeling refreshed after every night

Why: Early morning awakening, where a person wakes hours before intended and cannot fall back asleep, is a classic sleep disturbance associated with depression. It is one of the symptoms clinicians often ask about when assessing mood.

• A. Insomnia
• B. Hypersomnia ✓
• C. Somnambulism
• D. Narcolepsy

Why: Hypersomnia refers to excessive sleepiness or prolonged sleep, such as sleeping 10 or more hours a night or taking long daytime naps. It can occur in atypical depression and other mood conditions.

• A. It makes the brain more resistant to stress
• B. It has no measurable effect on emotional reactions
• C. It increases reactivity to negative emotional stimuli ✓
• D. It improves the ability to suppress negative thoughts

Why: Research shows that sleep loss heightens the brain's response to negative emotional stimuli, particularly in areas like the amygdala, while weakening connections with regions that help regulate emotion. This is one reason poor sleep can worsen irritability and mood instability.

• A. Daily consumption of alcohol before bed
• B. Cognitive behavioral therapy for insomnia (CBT-I) ✓
• C. Staying in bed for as long as possible each morning
• D. Avoiding all daytime light exposure

Why: CBT-I is a first-line, evidence-based treatment for chronic insomnia. It targets unhelpful sleep beliefs and behaviors, and studies suggest that improving sleep can also reduce depressive symptoms. Alcohol disrupts sleep architecture, and extended time in bed can worsen insomnia.

• A. It increases melatonin production during the day
• B. It raises physiological arousal, making it harder to fall asleep ✓
• C. It causes the body to sleep more deeply in every stage
• D. It eliminates the need for REM sleep

Why: Stress activates the body's fight-or-flight response, increasing heart rate, muscle tension, and alertness. This heightened arousal makes it harder to relax and fall asleep.

• A. Waking up feeling refreshed after a full night's sleep
• B. Racing thoughts, worry, or mental rumination that keep the mind active at bedtime ✓
• C. A deliberate technique for entering deep sleep faster
• D. The brain's natural tendency to dream during REM sleep

Why: Cognitive arousal refers to an overactive mind, such as worrying or ruminating, which prevents the transition into sleep. It is a key maintaining factor in insomnia and anxiety-related sleep problems.

• A. Checking work emails right before lying down
• B. Using the bed for problem-solving and planning
• C. Practicing a consistent wind-down routine such as slow breathing or light reading ✓
• D. Drinking a large amount of caffeinated beverages in the evening

Why: A consistent wind-down routine signals to the body that it is time to rest and lowers arousal. Slow breathing and calm activities like reading help shift the nervous system toward relaxation.

• A. Medications prescribed by doctors to treat sleep disorders
• B. A set of habits and environmental conditions that promote good sleep ✓
• C. Cleaning the bedroom to remove allergens
• D. The stage of sleep when the body repairs tissue

Why: Sleep hygiene covers habits such as consistent sleep schedules, a comfortable dark and quiet environment, and avoiding stimulants. These practices support healthy sleep and are often a first-line approach for anxiety-related sleep difficulties.

• A. It often leads to fragmented sleep with frequent awakenings and reduced deep sleep ✓
• B. It always causes people to sleep excessively long hours
• C. It has no measurable effect on sleep architecture
• D. It increases the amount of slow-wave sleep to compensate for stress

Why: Anxiety is associated with lighter, more fragmented sleep, more frequent nighttime awakenings, and reduced slow-wave (deep) sleep. These changes can leave a person feeling unrested even after a full night in bed.

• A. Going to bed at irregular times to match your daily schedule
• B. Keeping a consistent sleep and wake time, including on weekends ✓
• C. Napping for two or more hours in the late afternoon
• D. Using screens in bed to help you wind down

Why: A consistent sleep and wake schedule helps regulate the circadian rhythm, making it easier to fall asleep and stay asleep. Irregular timing, long afternoon naps, and screen use in bed all tend to disrupt sleep quality.

• A. These conditions increase the body's production of cortisol to keep you alert
• B. These conditions support the body's natural drop in core temperature and reduce sensory disruptions that can fragment sleep ✓
• C. These conditions make the brain produce more daytime melatonin
• D. These conditions prevent the brain from entering REM sleep

Why: A slight drop in core body temperature signals the body to sleep, and a cool room supports this process. Darkness supports melatonin release, and reducing noise and light limits awakenings that break up sleep cycles.

• A. Water taken with dinner
• B. A warm glass of milk
• C. Alcohol ✓
• D. A short bedtime stretching routine

Why: Alcohol may make people feel drowsy and help them fall asleep faster, but it disrupts sleep architecture, especially REM sleep, and often causes awakenings later in the night.

• A. Stay in bed and keep trying harder to fall asleep
• B. Check your phone for the time and news updates
• C. Get up, go to a dim and calm space, and return to bed when you feel sleepy ✓
• D. Eat a large meal to make yourself tired

Why: Lying in bed frustrated can create an association between the bed and wakefulness. Getting up and doing a quiet, relaxing activity in dim light until sleepy helps rebuild that bed-sleep association.

• A. Getting morning light exposure and regular physical activity ✓
• B. Staying indoors in dim light all day
• C. Consuming caffeine in the late afternoon and evening
• D. Sleeping in very late on weekdays to catch up

Why: Morning daylight helps anchor the circadian clock, and regular physical activity supports deeper sleep. Dim daytime light, late caffeine, and irregular sleep timing all tend to weaken the sleep-wake rhythm.

• A. Cognitive Behavioral Therapy for Insomnia; chronic insomnia ✓
• B. Cognitive Behavioral Therapy for Insomnia; sleep apnea
• C. Clinical Behavioral Training for Insomnia; occasional sleeplessness
• D. Cognitive Brain Therapy for Insomnia; narcolepsy

Why: CBT-I stands for Cognitive Behavioral Therapy for Insomnia. It is recommended as the first-line treatment for chronic insomnia, often preferred over sleep medications for long-term benefit.

• A. Stimulus control
• B. Sleep restriction ✓
• C. Cognitive restructuring
• D. Relaxation training

Why: Sleep restriction temporarily limits time in bed to the estimated actual sleep duration, building sleep pressure so that sleep becomes more consolidated and efficient.

• A. Nap whenever they feel tired during the day
• B. Use the bed for reading and watching television to feel relaxed
• C. Get out of bed if unable to sleep after about 20 minutes and return only when sleepy ✓
• D. Keep the same bedtime only on weekends

Why: Stimulus control aims to strengthen the association between the bed and sleep. Leaving bed when unable to sleep and returning only when drowsy prevents the bed from becoming linked with frustration and wakefulness.

• A. To eliminate all thoughts before bed
• B. To identify and challenge unhelpful beliefs about sleep and its consequences ✓
• C. To increase caffeine intake to stay alert
• D. To avoid discussing sleep problems with others

Why: Cognitive restructuring targets maladaptive beliefs, such as catastrophizing about one night of poor sleep, that increase anxiety and perpetuate insomnia. Replacing them with more realistic thoughts reduces sleep-related worry.

• A. Consuming alcohol to induce drowsiness before bed
• B. Keeping a consistent wake-up time every day ✓
• C. Exercising vigorously right before going to sleep
• D. Staying in bed longer after waking to make up for lost sleep

Why: A consistent wake-up time helps regulate the circadian rhythm, which supports sleep onset and maintenance. Alcohol fragments sleep, late vigorous exercise can be stimulating, and extended time in bed worsens sleep efficiency.

• A. Sleeping in on weekends to make up for lost sleep during the week
• B. Going to bed and waking up at roughly the same time every day, including weekends
• C. Going to bed whenever you feel tired, regardless of the time
• D. Waking up at different times each day to avoid boredom

• A. Screens make the room too cold for sleep
• B. Bright light from screens can suppress melatonin and make it harder to fall asleep
• C. Screens cause immediate physical exhaustion
• D. Screen use before bed improves memory consolidation

• A. A set of stimulating activities done right before bed to increase energy
• B. A consistent series of calming activities performed before sleep to signal the body it is time to rest
• C. A method of exercising intensely in the evening
• D. A schedule for napping throughout the day

• A. Keeping the room warm, bright, and noisy to stay alert
• B. Keeping the room cool, dark, and quiet
• C. Sleeping with all electronic devices turned on in the bedroom
• D. Using the bed for work and studying so you associate it with productivity

• A. Caffeine has no effect on sleep quality
• B. Caffeine can stay in the body for hours and interfere with the ability to fall and stay asleep
• C. Caffeine causes the body to produce extra melatonin
• D. Caffeine is only harmful when consumed in the morning