If a Person Goes Without Sleep for a Prolonged Period

If a person goes without sleep for a prolonged period of time,

A) the person eventually has to catch up on every hour of sleep that he or she missed.
B) sleepiness decreases at the end of a sleepless night, as morning arrives.
C) after a couple of days it becomes impossible to concentrate even for a very brief period of time.
D) the desire to sleep continues to increase steadily, in direct proportion to the period of deprivation.