Which of the following is a reason as to why sleep 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 4 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. The majority of sleep is spent in stage 4 slow-wave sleep.
Answer: b. A person who awakes from stage 4 is groggy and confused.
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