The Demand for Sleep (VCE SSCE Psychology): Flashcards

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Internal Biological Mechanisms that Regulate Sleep–Wake Patterns
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Circadian rhythms definition

Biological processes over a 24-hour period

Natural circadian rhythm length without external cues

Approx. 24.25 hours (free-run)

Most powerful zeitgeber

Light

Ultradian rhythms definition

Biological processes over periods shorter than 24 hours

Number & duration of sleep cycles in 8-hour sleep

Approx. 5 cycles, each lasting around 90 minutes

Location of suprachiasmatic nucleus (SCN)

Hypothalamus

Function of melatonin hormone

Induces drowsiness & decreases cellular activity

Where melatonin is produced

Pineal gland

Effect of low light on melatonin

SCN signals pineal gland to release melatonin

Effect of bright light on melatonin

SCN inhibits melatonin release

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The Demand for Sleep

Importance of Sleep to Mental Wellbeing

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Importance of Sleep to Mental Wellbeing

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Importance of Sleep to Mental Wellbeing

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Importance of Sleep to Mental Wellbeing

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