While You Are Watching TV, Your Mind Begins to Drift

Multiple Choice

While you are watching TV, your mind begins to drift and you become increasingly drowsy. You know the television is on, but you cannot distinguish which program is on. Then, your friend says, "You're asleep." You quickly state, "No, I'm not," but you really were. The sleep stage described would be

A) REM sleep.
B) Stage 1 of NREM sleep.
C) Stage 2 of NREM sleep.
D) Stage 3 of NREM sleep.