Gabe's roommate fell asleep about 25 minutes ago. Now, Gabe needs to awaken his roommate so they both can get to a party on time. His roommate is sleep talking about his girlfriend's cat. When Gabe begins laughing, his roommate wakes up. His roommate was MOST likely in sleep.

NREM-3                        

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.

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