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Describe and evaluate research into the nature of sleep including lifespan changes
(8+16)

Research into the nature of sleep and its stages has been primarily carried out by Dement and
Kleitman (1950s) who carried out highly controlled investigations of sleep using EEG cans in sleep
labs.
The conclusions drawn from…

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which is similar to adult SWS and REM. They spend 50% of their time in REM sleep, and by 6 months
they have a circadian rhythm established.

During early childhood children sleep for about 12 hours a day with about 30% REM. Boys sleep more
than girls and it's not…

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