Sleep Flashcards
How long is core sleep and what are its features?
First 5 hours - most of deep (stages 3&4), half of REM
How long is optional sleep and what are it’s features?
Next 2+ hours. Mostly stage 2&1.
How long is a normal circadian rhythm?
25 hrs
How does sleep vary with age?
Reduction in total sleep time, early reduction in %REM and later reduction in stages 3&4.
What is mean sleep duration?
7.75 hrs
Are dreams exclusive to REM?
No, but 2x more likely and 6x longer and more vivid.
What percentage of the population have insomnia?
30%
What are the three main types of insomnia?
Delayed sleep onset, disturbed sleep and early morning waking.
What are the features of narcolepsy?
0.02-0.05 of the population. Sleep attacks. Cataplexy - paralysis of voluntary muscles. Vivid sleep onset dreams.
What is sleep paralysis?
A temporary inability to move or speak that happens when you’re waking up or, less commonly, falling asleep. REM sleep intrusion.
How much of a reserve capacity does a person have?
1 night’s sleep loss. Only 1/3 of lost sleep recovered - priority for stage 4 and REM.
