front 1 Circadian rhythm | back 1 the 24-hour cycle of physical, mental, and behavioral changes that regulate the sleep-wake cycle and other bodily functions like hormone release and body temperature |
front 2 Dreams | back 2 vivid mental experiences (images, stories, emotions) during sleep |
front 3 Electroencephalograph (EEG) | back 3 a medical test that measures the electrical activity of the brain |
front 4 Hypersomnia | back 4 a sleep disorder characterized by excessive daytime sleepiness and a prolonged need for sleep that leaves you feeling unrested |
front 5 Insomnia | back 5 a common sleep disorder marked by difficulty falling asleep, staying asleep, or waking too early |
front 6 Melatonin | back 6 a hormone your body naturally produces to regulate sleep |
front 7 Napping | back 7 sleeping for a short period during the day to boost alertness, memory, and mood |
front 8 Narcolepsy | back 8 appears to be a misspelling of narcolepsy, a chronic neurological disorder characterized by excessive daytime sleepiness, involuntary sleep episodes, and a sudden loss of muscle tone (cataplexy) |
front 9 Night Terrors | back 9 episodes of screaming, thrashing, and panic that occur during deep sleep, |
front 10 Nightmares | back 10 frightening, vivid dreams that occur during REM sleep, often causing fear, anxiety, or distress |
front 11 Parasomnia | back 11 sleep disorders causing unusual behaviors, experiences, or movements during sleep, falling asleep, or waking |
front 12 Restless Legs Syndrome | back 12 a neurological disorder characterized by an irresistible urge to move the legs, typically accompanied by uncomfortable sensations like crawling or aching |
front 13 Sleep | back 13 a crucial biological process where the brain and body repair, restore, and process information, cycling through stages like REM and non-REM, essential for memory, immunity, hormone balance, and overall health |
front 14 Sleep apnea | back 14 a sleep disorder characterized by repeated pauses in breathing during sleep, often accompanied by loud snoring |
front 15 Sleep deprivation | back 15 when a person doesn't get enough sleep |
front 16 Sleep paralysis | back 16 temporary inability to move or speak when falling asleep or waking up, often accompanied by a feeling of being awake but unable to move, and sometimes vivid hallucinations |
front 17 Sleep study | back 17 a test to diagnose sleep disorders by monitoring brain waves, eye movement, muscle activity, and other vital signs during sleep |
front 18 Snoring | back 18 a common sound from vibrations of throat tissues during sleep due to partial airway obstruction, often caused by relaxed muscles, sleeping on your back, alcohol, or nasal issues, with risk factors like age, obesity, and anatomy |
front 19 Stage 1 (Non-REM) sleep | back 19 the initial, light stage of sleep that transitions you from wakefulness to sleep |
front 20 Stage 2 (Non-REM) sleep | back 20 a light stage of sleep where the heart rate and breathing slow down, the body temperature drops, and eye movements stop |
front 21 Stage 3 (Non-REM) sleep | back 21 the deepest stage of sleep, where the body repairs and regenerates tissues, builds bone and muscle, and strengthens the immune system |
front 22 Stage 4 (REM Sleep) | back 22 the final and most active stage of the sleep cycle |
front 23 Somnambulism | back 23 a sleep disorder that involves walking or performing other complex behaviors while in a state of deep sleep, typically during the first third of the night |
front 24 Wakefulness | back 24 the state of being awake, conscious, and aware of one's surroundings, as opposed to sleep |