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biological rhythms, sleep wake cycle - Coggle Diagram
biological rhythms
circadian
approx 24h
body temperature
fluctuates up to a degree
influenced by
muscular activity
digestion
heat loss
heat production
mid afternoon
37.1 degrees
approx 4am
36.7 degrees
influenced by endogenous pacemakers
internal factors
internal body clock
found in hypothalamus
SCN synchronises sleep wake
recieves light through optic nerve (eyes)
info recieved by SCN
fire impulse to pineal gland
secretes melatonin
sleepiness
maintains regular rhythms in absence of zeitgeibers
synchronise to individual behavious
influenced by exogenous zeitgebers
external factors
stimuli
provides info about elapsed time
changes in body activity/patterns of bio rhythms
e.g Siffre
infradian
longer than 24h
menstrual cycle
follicular phase
10-14 days
beginning (period)
ovulating phase
luteal phase
SAD
Seasonal Affective Disorder
depression in the winter months
sept/dec-feb
sensitive to lack of light
low serotonin
light therapy
sit by bright light after waking up
reduce melatonin
prescribed anti depressants
ultradian
less than 24 hours
sleep cycle
alertness/activity over a 90 min cycle
stage 1-2
light sleep
stage 3-4
deep sleep
stage 5
REM sleep
20-25% of time
dreaming
muscles relax
don't act out dream
change in physiological activity that repeats periodically in a set pattern
shift lag
jet lag
sleep wake cycle