To Determine Whether a Given Individual Is Suffering from Insomnia

Multiple Choice

To determine whether a given individual is suffering from insomnia, which question should we ask?

A) Does the person get as much sleep as the average for other people of the same age?
B) Does the person get the same amount of sleep now as he or she did in the past?
C) Does the person get at least 20% REM sleep?
D) Does the person consistently feel tired and inefficient during the day?