Bulgarian translation: 'ултрадианен' цикъл на съня
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07:09 Mar 11, 2008
English to Bulgarian translations [PRO] Medical - Medical (general) / Sleeping Disorders
English term or phrase:the "ultradian" sleep cycle
The first REM sleep episode usually occurs in the second hour of sleep. More rapid onset of REM sleep in a young adult (particularly if less than 30 min) may suggest pathology such as endogenous depression, narcolepsy, circadian rhythm disorders, or drug withdrawal. NREM and REM alternate through the night with an average period of 90 to 110 min (the "ultradian" sleep cycle). Overall, REM sleep constitutes 20 to 25% of total sleep, and NREM stages 1 and 2 are 50 to 60% (increasing in elderly subjects).