Which of the following is a reason why stage 4 is considered to be the deepest sleep stage?
A) A person in this stage is easily roused by meaningful stimuli.
B) A person who awakes from stage 1 is groggy and confused.
C) A person who awakes from this stage is alert and attentive.
D) Only very loud stimuli will awaken a person from stage 4 sleep.
E) Napping in stage 4 reduces the amount of sleep required per night.
Question 2
Sleep stages 3 and 4 are also called
A) REM sleep.
B) high-frequency sleep.
C) slow-wave sleep.
D) paradoxical sleep.
E) rhythmic sleep.