Sleep stages

Question 1

Stage 1

Answer 1

Low frequency
High amplitude
Alpha waves

then

Low frequency
Low amplitude
Theta waves

Question 2

Stage 2

Answer 2

Low frequency
Low amplitude
Theta waves

*Sleep spindles
*K-Complexes (large slow waves)

Question 3

Stage 3

Answer 3

Low frequency
High Amplitude
Delta waves

Question 4

Stage 4

Answer 4

Low frequency
Even Higher Amplitude
Delta waves

Question 5

REM

Answer 5

80 to 90 minutes into sleep

-EEG looks similar to stages 1
-active brain and arousal
*most dreams occur in this stage
*as night goes on REM stages increase and stages 3 and 4 decrease.

Question 6

New borns

Answer 6

Sleep longer than older children
Spend more time in REM
Start sleep period with REM

Question 7

Older adults

Answer 7

-Don’t need more sleep
-Have greater difficulty falling asleep
-Spend less time in deep sleep
-Experience disruptive REM sleep
-Wake up more
-Experience advanced sleep phases