A Patient Experiencing Primary Insomnia Says She Takes a Nap

A patient experiencing primary insomnia says she takes a nap during the day and asks the nurse, "Doesn't that make up for a lost night's sleep?" Select the nurse's best reply.

A) "Circadian drives give daytime naps a structure different from nighttime sleep."
B) "The body clock operates on a 24-hour cycle, making nap effectiveness unpredictable."
C) "It is a matter of habit and expectation. We expect to be more refreshed from a night's sleep."
D) "Sleep restores homeostasis but works more efficiently when aided by melatonin secreted at night."