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Slide 1

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Biological Rhythms - Topic 2…read more

Slide 2

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Infradian Rhythms: Under 24 hours
Circadian Rhythms: 24 hours
Ultradian Rhythms: More than 24 hours…read more

Slide 3

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Sleep Stages AO1
· Sleep stages are within the sleep wake cycle.
· In stages one to four you have NREM (non rapid eye
movement) sleep
· In the 5th Stage you have REM (rapid eye movement)
· Each sleep cycle lasts approximately 90 minutes…read more

Slide 4

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Sleep Stages AO1
Relaxed, easily woken up, heart Stage 1
rate slows, body temperature
Stage 2
Stage 3
The metabolic rate is at its Stage 4
slowest and the growth
hormone is being produced Stage 4
Stage 3
Relaxed, easily woken up, heart
rate slows, body temperature
Stage 2
The brain and eyes are active Stage 5
but your body is paralyzed. This ­ REM
is when you dream sleep…read more

Slide 5

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Sleep Stages AO2
· Is it dreaming sleep?
Dement and Kleitman (1957)
· When participants were woken during REM sleep they were more
likely to report dreaming
· BUT dreams were also recorded in NREM and they weren't always
recorded during REM
· REM therefore might not be dream sleep.
· It might just be called dream sleep to let Psychology theorists
explain dreaming
Hooson and McCarley (1977)
· Dreams are simply a read out of REM's random electrical signals
· Theories of dreaming are based on the wrong assumption that REM
activity is dreaming activity…read more

Slide 6

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Sleep Stages AO2
· Can we change our sleep cycle?
Born et al (1999)
· Participants were told to wake up earlier
· They were found to have more ACTH at the designated
time than normal
· ACTH helps you wake up
· Suggests our sleep cycle can be changed…read more

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