front 1 Circadian rhythm | back 1 physical, mental, and behavioral changes that follow a 24-hour cycle. |
front 2 Dreams | back 2 a series of thoughts, images, and sensations occurring in a person's mind during sleep. |
front 3 Electroencephalograph | back 3
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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 habitual sleeplessness; inability to sleep. |
front 6 Melatonin | back 6 a hormone that your brain produces in response to darkness. |
front 7 Napping | back 7 sleep lightly or briefly, especially during the day. |
front 8 Narcolepsy | back 8
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front 9 Night Terrors | back 9 a sudden feeling of extreme fear that awakens a sleeping person, usually during slow-wave sleep, and is not associated with a dream or nightmar |
front 10 Nightmares | back 10 a frightening or unpleasant dream. |
front 11 Parasomnia | back 11 any of a group of sleep disorders characterized by the regular occurrence of abnormal movements, vocalizations, or experiences, such as sleepwalking, talking in one's sleep, or night terrors. |
front 12 Restless Legs Syndrome | back 12 a neurological disorder that causes unpleasant or uncomfortable sensations in your legs and an irresistible urge to move them. |
front 13 Sleep | back 13 a condition of body and mind that typically recurs for several hours every night, in which the eyes are closed, the postural muscles relaxed, the activity of the brain altered, and consciousness of the surroundings practically suspended. |
front 14 Sleep apnea | back 14 a common condition in which your breathing stops and restarts many times while you sleep. |
front 15 Sleep deprivation | back 15 the situation or condition of suffering from a lack of 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 measures and records different body functions while you sleep. |
front 18 Snoring | back 18 the action or fact of making a snorting or grunting sound while asleep. |
front 19 Stage 1 (Non-REM) sleep | back 19 the first sleep stage you enter when nodding off. |
front 20 Stage 2 (Non-REM) sleep | back 20 a continued slowing of heartbeat, breathing, muscle activity, and eye movements. |
front 21 Stage 3 (Non-REM) sleep | back 21 deep sleep |
front 22 Stage 4 (REM Sleep) | back 22 Rapid eye movement |
front 23 Somnambulism | back 23 Somnambulism |
front 24 Wakefulness | back 24 a condition of being alert, rather than sleepy |