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What is a circadian rhythm and what is an example
Biological process that takes approximately 24h
Endogenous pace maker
Internal body clock
Exogenous zietgeber
Environmental cue that helps regulate the bodily clock
Describe the sleep wake cycle
7-wake up
11-most alert
2-dip in alertness due to lunch
6-max temp
11-sleep
2-deepest sleep
4:30-min temp
Supercharesmatic nuclei
Endogenous pacemaker
Master clock in hypothalamus sensitive to light - pituitary gland -melatonin
What did Siffer do
In a cave for 6month no exogenous zeitgeber sleep wak cycle only went to 25h
Limitation
Individual differences-czeister et al-sleep wake cycle can vary between 13-65h
Strength
Understand consequences of desynchronisation-shift workers-bovin et al-3x more likely of heart disease
Improved medical treatment-chronotheraputics-can time the medication to kick in at peak time due to body changing throughout the day
