Which stage of NREM sleep is associated with anabolic processes?
a. N1
b. N2
c. N3
d. N4
C
In stage N3 sleep, slow waves continue to develop until 50% of the EEG waveforms are slow wave. This stage of sleep is often referred to as slow-wave sleep. The release of other hormones, such as prolactin and testosterone, suggests that anabolism occurs during the slow-wave sleep of stage N3 . N1 sleep is a transitional, lighter sleep state from which the patient can be easily aroused by light touch or by softly calling his or her name. Stage N2 sleep occupies about 45% to 55% of the night, with sleep deepening and a higher arousal threshold being required to awaken the patient. N4 sleep does not exist.
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