Which of the following is a true statement about naps? A. Daytime naps invariably lead to insomnia. B. Daytime naps are invariably refreshing and an efficient way to rest. C. Daytime naps are not very...

Which of the following is a true statement about naps?

A. Daytime naps invariably lead to insomnia.

B. Daytime naps are invariably refreshing and an efficient way to rest.

C. Daytime naps are not very efficient ways to sleep, but their eff ects are variable and can be beneficial.

D. Taking many naps during the day can substitute for a full night’s sleep.