sleep cucle Flashcards
What is the transition period from wakefulness to light sleep called?
Stage 1
Stage 1 is characterized by a slowing of heartbeat and breathing, lasting about 10 minutes.
How long does Stage 2 of sleep typically last?
20 minutes
Stage 2 involves further slowing of heartbeat and features sleep spindles and K complexes.
What type of brain waves are associated with Stage 1 sleep?
Alpha waves
Alpha waves mark the transition from wakefulness to light sleep.
What characterizes the brain activity during Stage 5 sleep?
Full REM sleep
Stage 5 is the deepest sleep stage where brain activity speeds up, resembling the awake brain.
What are sleep spindles and K complexes?
High frequency brain waves
These are bursts of rapid rhythmic brain wave activity seen in Stage 2 sleep.
What happens to heart rate and breathing during Stage 3 and 4 sleep?
They reach their lowest levels
Stages 3 and 4 involve slow delta waves and are the deepest periods of sleep.
How long do Stages 3 and 4 of sleep last?
20-40 minutes
These stages are characterized by greater amplitude slow delta waves.
What is the primary characteristic of REM sleep?
Body paralysed
During REM sleep, dreaming occurs and brain activity resembles that of an awake brain.
True or False: REM activity in sleep is highly correlated with the experience of dreaming.
True
Research suggests a strong correlation between REM sleep and dreaming.
What type of waves are present in Stage 2 of sleep?
Theta waves
Theta waves indicate that sleep is becoming deeper.
Fill in the blank: The deepest period of sleep occurs during stages ___ and ___.
3 and 4
These stages are characterized by slow delta waves and difficulty in awakening.
What is the duration of REM sleep after sleep onset?
90 minutes
REM sleep occurs approximately 90 minutes after falling asleep.
