For several nights in a row, a sleep researcher wakes you up whenever you show signs of entering rem sleep. on the first night that you are allowed to sleep uninterrupted, you will most likely experience:

The correct answer is REM rebound.

Explanation:

REM rebound refers to the phenomenon where the frequency of rapid eye movement (REM) sleep increases after prior instances of REM sleep deprivation.

REM sleep refers to one of the five stages of sleep we experience during the period we sleep at night. REM is an important state of sleep, where dreaming occurs more frequently, our muscles deeply, and memories and events are consolidated most effectively. Adequate REM sleep is highly important for feeling well rested and for optimal cognitive functioning.  Deprivation of REM sleep results in more grogginess, fatigue, poorer memory and negative mood.

In this instance, if a sleep researcher wakes you up whenever you show signs of entering REM sleep several nights in a row, on the first night that you are allowed to sleep uninterrupted, you will most likely experience REM rebound so that you can make up for the lost REM sleep, and thus you will experience this kind of sleep more frequently and deeply.

a symbiotic relationship with the mitochondria