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When first born, we don't have a circadian
rhythm, and we sleep in total for about 16
hours a day.
First born babies normally just immediately
enter REM sleep, known as active sleep in
At about 3 months old, the sequence of
REM/NREM sleep is established.
Over months, the proportion of REM sleep
Circadian rhythm established at about 6
months.…read more

Slide 3

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By the age of 5 ­ children have EEG patterns
that look like those of an adult.
But, they sleep more and have more REM
Boys sleep more than girls.
During childhood, parasomnias appear, such
as sleep walking and night terrors.…read more

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9-10 hours of sleep are required.
Less REM sleep is experienced.
Circadian rhythms change so teenagers
become more awake at night and find it harder
to wake up in a morn.
Exogenous zeitgebers become worse as
teenagers normally have part time work,
studies and socialising to think about.…read more

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Around 8 hours of sleep needed, 25% REM.
Sleep disorders such as insomnia occur more.
During middle age, a shallowing and
shortening of sleep may occur.
Decrease in stage 4 sleep and becomes harder
to stay awake or feel refreshed after waking.
Factors such as caffeine, alcohol & lack of
exercise contributes to lack of sleep.…read more

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Frequent interruptions and periods of
Stage 3 & 4 is reduced, perhaps due to a
reduced need for growth hormones.&
REM sleep decreases to 20% of total sleep time.
Phase advance in circadian rhythms, feeling
sleepier earlier and waking up earlier.…read more

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