Stages of Sleep Flashcards
1
Q
sleep
A
a state of reduced conscious awareness during which the body is less active and less responsive to the outside world
2
Q
polysomnography
A
a study of a sleeping individual that records multiple physical changes in the brain and the body
3
Q
EEG
A
used to measure brain activity
4
Q
Stage 1
A
- first 10-15 mins
- Light sleep
- will not report sleeping if woken
5
Q
Stage 2
A
- 10-20 mins into sleep
- brain produces sleep spindles (bursts of brain waves)
- decrease in body temperature and heart rate
6
Q
Stage 3
A
- start of deep sleep
- slow waves (delta waves) produced
- unresponsive and hard to wake
7
Q
Stage 5 (REM)
A
- 90 mins into sleep
- eyes move rapidly beneath eyelids
- body paralysed
- dreaming occurs
8
Q
sleep cycle
A
- cycle repeats 4-5 times
- with each subsequent cycle, less time is spent in REM
