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| 11434137012 | Conciousness | our awareness of ourselves and our environment | 0 | |
| 11434141545 | biological rhythms | periodic physiological fluctuations | 1 | |
| 11434143578 | circadian rhythm | the biological clock; regular bodily rhythms (for example, of temperature and wakefulness) that occur on a 24-hour cycle | 2 | |
| 11434146773 | REM sleep | Rapid eye movement sleep, a recurring sleep stage during which vivid dreams commonly occur. Also known as paradoxical sleep, because the muscles are relaxed (except for minor twitches) but other body systems are active. | 3 | |
| 11434147472 | alpha waves | the relatively slow brain waves of a relaxed, awake state | 4 | |
| 11434147473 | sleep | periodic, natural loss of consciousness--as distinct from unconsciousness resulting from a coma, general anesthesia, or hibernation | 5 | |
| 11434149624 | Hallucinations | false sensory experiences, such as seeing something in the absence of an external visual stimulus | 6 | |
| 11434150409 | delta waves | the large, slow brain waves associated with deep sleep | 7 | |
| 11434161684 | insomnia | recurring problems in falling or staying asleep | 8 | |
| 11434213038 | seasonal affective disorder | a depressed mood during winters dark months | 9 | |
| 11434241681 | suprachiasmatic nucleus | a pair of cell clusters in the hypothalamus that controls circadian rhythm | 10 |
