Types of sleep Flashcards
What is the percentage of time spent in NREM sleep?
80%
What is the duration of stage 1 NREM sleep?
5-10mins
What is the duration of stage 2 NREM sleep?
20mins
What is the duration of Stage 3 NREM sleep?
10mins
What is the duration of stage 4 NREM sleep?
20mins
What are the characteristics of stage 1 NREM sleep?
- gradually lose awareness
- sometimes experience hypnic jerk
- occurs as we drift into sleep state
- beta waves replace alpha waves
What are the physiological changes in NREM stage 1 sleep?
Lower level of bodily arousal
v heart rate, respiration, body temp, muscle tension
What are the characteristics of NREM stage 2 sleep?
- light sleep
- sleep spindles + K complexes
- hallmark of being truly asleep
What are the physiological changes in stage 2 NREM sleep?
- blood pressure + temp continue to fall
- heart rate = slower
What are the characteristics of stage 3 NREM sleep?
- 20-50% delta waves
- extremely difficult to wake
- relaxed + less responsiveness to outside world
What are the physiological changes in stage 3 NREM sleep?
- heart rate, blood pressure + body temp continue to drop
- breathing rate continues to be slow + steady
What are the characteristics of stage 4 NREM sleep?
- 50%+ of delta waves
- ppl difficult to wake
- sleepwalking, sleeptalking, night terrors + bed wetting
What are the physiological changes of stage 4 NREM sleep?
Muscles are completely relaxed
Does the amount of REM sleep increase/decrease as duration increases?
Increases
What are the characteristics of REM sleep?
- majority dreaming occurs that = have a narrative + easier to remember
- sleeper is totally relaxed and appears paralysed
- beta like waves
- embedding/consolidating new memories + strengthening newly formed neural connections
- serve important biological need
