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Slide 1

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The Nature of sleep and lifespan
Topic 5…read more

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Key terms:
· SWS = slow wave sleep
· REM = rapid eye movement
· NREM = non rapid eye movement
· Active sleep = immature REM sleep
· Quiet sleep = immature NREM sleep…read more

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Lifespan changes
Birth Death

Slide 4

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Babies AO1
· Sleep 16 hours a day ­ BUT not continuously (They wake up every hour
or so)
· They have shorter sleep cycles than the adult 90 minute cycle
· They also have an immature version of the adults SWS and REM sleep
· For babies it's known as quiet and active sleep
· Babies have more active sleep (REM) than adults. About half their sleep
is active sleep.
· Adults go to deep sleep quite quickly whilst babies gradually enter deep
sleep after approximately 20 minutes
· At 6 months their sleep wake cycle is established
· At 1 year they sleep mainly at night…read more

Slide 5

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Babies AO2 ­ why are their sleep
patterns different?
· It could have an evolutionary explanation
· It may be adaptive because
­ Daytime sleep means parents can continue with
their normal activities
­ This would ensure survival
­ Waking up at night is adaptive for babies too
­ They have small tummy's so need food often
· Therefore it may have been adaptive to
ensure the babies and parents survival…read more

Slide 6

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Babies AO2 ­ Why do babies have
more REM?
· Babies have an immature brain which means they're learning a
· REM sleep is linked to producing neurotransmitters and with
consolidating memories
· This could be why babies have so much active (REM) sleep
· It is supported by the fact that premature babies have
approximately 90% active sleep
· This is because their brains are even less mature
· This explains why babies have a significantly higher amount of
REM sleep…read more

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