Sleep and Dreams Flashcards
1
Q
how many cycles are in the sleep cycle?
A
5
2
Q
how many out of 5 are REM?
A
1
3
Q
how long is one cycle?
A
90 minutes
4
Q
how many full cycles do we go through each night?
A
4-6 cycles
5
Q
describe stage 1
A
- lasts between 1 and 10 minutes
- lightly asleep
- may roll eyes and slightly open eyelids
- hypnic jerk
- hypnagogic images
6
Q
describe stage 2
A
- lasts about 20 minutes
- slowing of heart rate
- decrease in body temp
- preparation for deep sleep
- 45% of our sleeping time in stage 2
7
Q
describe stage 3
A
- 35-45 minutes after falling asleep
- most potential for sleep disturbances without showing any reaction
- blood pressure drops
- growth hormones released
- energy restored
8
Q
describe stage 4
A
- deepest level of sleep
- lasts about 30 minutes
- blood pressure drops
- growth hormones released
-bone and tissue development - bed wetting, sleep walking, night terrors may occur at the end of stage 4
