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Individuals and populations 1 > Sleep > Flashcards

Flashcards in Sleep Deck (11)
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1
Q

How long is core sleep and what are its features?

A

First 5 hours - most of deep (stages 3&4), half of REM

2
Q

How long is optional sleep and what are it’s features?

A

Next 2+ hours. Mostly stage 2&1.

3
Q

How long is a normal circadian rhythm?

A

25 hrs

4
Q

How does sleep vary with age?

A

Reduction in total sleep time, early reduction in %REM and later reduction in stages 3&4.

5
Q

What is mean sleep duration?

A

7.75 hrs

6
Q

Are dreams exclusive to REM?

A

No, but 2x more likely and 6x longer and more vivid.

7
Q

What percentage of the population have insomnia?

A

30%

8
Q

What are the three main types of insomnia?

A

Delayed sleep onset, disturbed sleep and early morning waking.

9
Q

What are the features of narcolepsy?

A

0.02-0.05 of the population. Sleep attacks. Cataplexy - paralysis of voluntary muscles. Vivid sleep onset dreams.

10
Q

What is sleep paralysis?

A

A temporary inability to move or speak that happens when you’re waking up or, less commonly, falling asleep. REM sleep intrusion.

11
Q

How much of a reserve capacity does a person have?

A

1 night’s sleep loss. Only 1/3 of lost sleep recovered - priority for stage 4 and REM.