Abstract
Sleep is critical to normal physiological and psychological function, and people spend nearly one third of their lives asleep. Usual sleep duration is considered to be between 7 and 9 hours per night for healthy adults. The different stages of sleep have historically been defined according to the 1968 classification rules of Alan Rechtschaffen and Anthony Kales (R&K) as wakefulness, one of four stages of non-rapid eye movement (NREM) sleep (S1, S2, S3, and S4), or rapid eye movement (REM) sleep.
Original language | English |
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Title of host publication | Encyclopedia of Sport and Exercise Psychology |
Editors | Robert C. Eklund, Gershon Tenenbaum |
Place of Publication | California, United States |
Publisher | Sage Publishing/Sage Publications |
Pages | 682-684 |
Number of pages | 3 |
ISBN (Print) | 9781452203836 |
Publication status | Published - 2014 |
Externally published | Yes |
Keywords
- Sleep
- Exercise
- Athletes
- Athletic performance
- Sleep loss
- Sleep disorders