4+Sleep+2 - Sleep Circadian Rhythms Alertness Temperature...

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Sleep
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Alertness Temperature Growth Hormone Cortisol Potassium Circadian Rhythms
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Suprachiasmatic nucleus (SCN) * Light can be used as a zeitgeber (time giver) to entrain the cycle. * Suprachiasmatic nucleus
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Effects of SCN lesion Sleep state Temperature Sleep state Temperature Time of Day Normal Lesioned
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Light inhibits melatonin Light excites special receptors in the eye that are not involved with vision The inhibited SCN inhibits the superior cervical ganglion (SCG) Inhibition of the SCG inhibits the pineal gland The inhibited pineal inhibits melatonin production This activity then inhibits the suprachiasmatic nucleus (SCN)
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Dark stimulates melatonin
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Development of Sleep Patterns Decreased sleep with age may be due to decreased melatonin.
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Teens have different sleep patterns • Teens do not have a melatonin surge until much later at night than adults or children. • They often do not get the 9.2 hours of sleep they need; 26% of them average 6.5 hours. • High schools tend to start at 8 am or even
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4+Sleep+2 - Sleep Circadian Rhythms Alertness Temperature...

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