At 3 o'clock in the morning, John has already slept for 4 hours. As long as his sleep continues, we can expect an increasing occurrence of

At 3 o'clock in the morning, John has already slept for 4 hours. As long as his sleep continues, we can expect an increasing occurrence of







A) hypnagogic sensations.
B) muscle tension.
C) REM sleep.
D) Stage 4 sleep.






Answer: C