front 1 circadian rhythm | back 1 physical, mental, and behavioral changes that follow a 24-hour cycle |
front 2 Dreams | back 2 a succession of images, ideas, emotions, and sensations that usually occur involuntarily in the mind during certain stages of sleep |
front 3 Electroencephalograph (EEG) | back 3 a medical test used to measure the electrical activity of the brain |
front 4 Hypersomnia | back 4 medical conditions in which you repeatedly feel excessively tired during the day (called excessive daytime sleepiness) or sleep longer than usual at night |
front 5 Insomnia | back 5 trouble falling asleep, staying asleep, or getting good quality sleep. This happens even if you have the time and the right environment to sleep well |
front 6 Melatonin | back 6 a hormone that your brain produces in response to darkness |
front 7 Napping | back 7 short and meant to give you a bit of rest |
front 8 Narcolepsy | back 8 a chronic neurological disorder that affects the brain's ability to control sleep-wake cycles |
front 9 Night Terrors | back 9 Episodes of screaming, intense fear, and flailing while still asleep, often paired with sleepwalking |
front 10 Nightmares | back 10 Frightening dreams, usually during REM sleep, that are normal and common in children under 10 and can also affect teens and adults. |
front 11 Parasomnia | back 11 occur in a state that lies between sleep and wakefulness |
front 12 Restless Legs Syndrome | back 12 typically occurs while sitting or lying down. It generally worsens with age and can disrupt sleep |
front 13 Sleep | back 13 a state of reduced mental and physical activity in which consciousness is altered and sensory activity is inhibited to a certain extent |
front 14 Sleep apnea | back 14 A potentially serious sleep disorder in which breathing repeatedly stops and starts. |
front 15 Sleep deprivation | back 15 means you're not getting enough sleep |
front 16 Sleep paralysis | back 16 a temporary inability to move or speak that occurs directly after falling asleep or waking up |
front 17 Sleep study | back 17 a test that records the activity of the body during sleep |
front 18 Snoring | back 18 Hoarse or harsh sound from nose or mouth that occurs when breathing is partially obstructed while sleeping. |
front 19 Stage 1 (Non-REM) sleepw | back 19 the first sleep stage you enter when nodding off |
front 20 Stage 2 (Non-REM) sleep | back 20 still light sleep, but deeper than stage 1. |
front 21 Stage 3 (Non-REM) sleep | back 21 known as N3 or deep sleep |
front 22 Stage 4 (REM Sleep) | back 22 your voluntary muscles become immobilized |
front 23 Somnambulism | back 23 The act of getting up and walking around while asleep. |
front 24 Wakefulness | back 24 a daily recurring brain state and state of consciousness in which an individual is conscious and engages in coherent cognitive and behavioral responses to the external world. |