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| 2206858976 | NREM (non-rapid eye movement) sleep | Sleep stages 1-4; they are accompanied by gradually slower and deeper breathing; a calm, regular heartbeat; reduced blood pressure; and slower brain waves. (Stages 3 and 4 are called slow-wave sleep.) | 0 | |
| 2206862756 | REM (rapid eye movement) sleep | The stage of sleep during which muscle tone decreases dramatically but the EEG resemble that of someone who is awake; occurs in the second sleep stage. | 1 | |
| 2206864574 | insomnia | a sleep disorder in which a person has trouble falling asleep or staying asleep at night | 2 | |
| 2206865515 | narcolepsy | a daytime sleep disorder in which a person suddenly switches from an active waking state into REM sleep | 3 | |
| 2206866665 | sleep apnea | a sleep disorder in which a person briefly but repeated stops breathing during the night | 4 | |
| 2206874339 | sudden infant death syndrome (SIDS) | a disorder in which a sleeping baby stops breathing, does not awaken, and dies | 5 | |
| 2206877757 | sleepwalking | a phenomenon that starts primarily in non-REM sleep, especially in stage 4, and involves walking while sleep; usually occurs during childhood | 6 | |
| 2206888422 | nightmares | frightening dreams that take place during REM sleep | 7 | |
| 2206897632 | sleep terror disorder (night terrors) | the occurrence of horrific dream images during stage 4 sleep, followed by rapid awakening and a state of intense fear; especially common in children; adults have milder versions | 8 | |
| 2206907304 | REM behavior disorder | a sleep disorder in which the decreased muscle tone normally seen in REM sleep does not appear, this allowing dreams to be acted out; common in patients with Parkinson's disease and is often the first sign of a degenerative brain condition | 9 |
