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Other names: Endep

SLEEP AND INSOMNIA: CORE SLEEP
In Why We Sleep Dr Home proposes that the really essential part of sleep consists of Stages 3 and 4, which he calls collectively Slow Wave Sleep (SWS). During these stages the brain is in what he calls on ‘off-line’ state: it is the only time during which this hard-working organ is totally at rest. SWS occurs largely during the first three cycles, that is, during the first half of a night’s sleep.
When people are deprived of sleep by staying up all night, it has been found that they don’t need to catch up with all the sleep they’ve lost. They recover no extra light sleep, and only a fraction of REM sleep. But they do recover all the lost deep sleep, which suggests that that is the sleep that is really essential.
In people who naturally need less sleep than the average, the same pattern is followed during the first few hours as in average sleepers. Although these people sleep for fewer hours, says Dr Home, they are getting the essential Slow Wave Sleep: ‘It is as though these short sleepers have somehow done away with what seems to be the flexible non-restorative sleepthe latter hours of sleep.’
His conclusion is that so long as we get our ration of Core Sleep, consisting of Slow Wave Sleep and some REM sleep, the brain will recover from its waking wear and tear. The rest he calls ‘optional sleep’, which has no essential purpose but ‘fills the tedious hours of darkness until sunrise, maintaining sleep beyond the point where core sleep declines’, and it may in fact not be really necessary.
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