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PSYC111 - Coggle Diagram
PSYC111
Lecture 8: Sleep
Circadian Rhythm: internal body clock of that regulates physiological processes according to a 24 hour cycle
Examples: Body temperature, melatonin, sleep propensity
Wake Maintenance zone: The period before bed where alertness is at its peak. Evolutionary theory is that animals that are alert just before bed are more likely to survive as they can make arrangements that ensure they are safe during the night.
Melatonin is a naturally occurring hormone that increases sleepyness. Levels are low during the day but increase in the evening and during the night. Peak in melatonin is around 3am in the morning.
Free running sleep wake cycle: Without entrainment an animals internal body clock is found to cycle around 25 hours instead of 24. Consequently, when sleep/ activity is plotted on an attogram, activity is found to start later by an hour each day.
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Suprachiasmatic nucleus: "master" internal clock that regulates physiological activity. Is activated by light
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Melanopsin Receptors: located in the eye. Respond to light and activate the SCN. Light induced activation of the SCN prevents the pineal gland from producing melatonin. L
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