Answer:
NREM-3
Step-by-step explanation:
NREM-3 sleep refers to the process that involves sleep at stage three in which an individual's breathing rate and blood pressure drop, muscles relaxes, and the deepest sleep occurs. Stage three of NREM sleep lasts for about five to fifteen minutes. During NREM sleep, the body of a person tends to regenerate tissues and strengthen the immune system.
In reference to the question above, Gabe's roommate was most likely in NREM-3 sleep.