PSY 4327 Lecture Notes - Lecture 8: Sleep Spindle, Delta Wave, Suicidal Ideation

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10 Aug 2016
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The different factors influencing the length of sleep in mammals (Moorcroft)
A. Relationship predator-prey
B. Thequality,quantity,andavailabilityofthe food supply (do they need to spend more time
searching for food? Or do they have more time to spend asleep?)
C. Thesafetyofsleepinghabitat
D. Is the species warm or cold blooded?
E. Thedegreetowhichthebrainisdevelopedat
Birth (animals like horses and cows are born able to walk)
F. Bodysizeofthespecies
G. Events and activities (brooding, hibernation,
injury, copulation)
ONTOGENESIS OF SLEEP
•Newborns and Toddlers
•Adolescents •Adults •Seniors
NEWBORNS
Quiet sleep (QS, like N3) Active sleep (AS, like REM) Intermediate sleep (IS)
QS & AS alternate in a 50 to 60 min cycle
Quiet awake
Active awake
Sleep makes up 16 to 18 hours of 24 The sleep-wake cycle is about 3-4 hours
TODDLERS
Active sleep (AS) becomes REMS after about 12 weeks of age
Total sleep time drops to 14-15 hours by 16 weeks and 10-12 hours between ages 3-5
Within 10 min, fall in N3 for an hour or so.
Naps disappear around 3 years
By age 10 sleep is similar to adult sleep but longer (10hrs)
ADOLESCENTS
Teens need 8.5 to 9.25 hours but most get only 6 to 7 hours per night Things are made worse by
going to bed late and « sleeping in »
The big problem with a lot of teens is that
• They need more sleep than they get
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