What happens if a sleep researcher deprives a person of rem sleep by waking the sleeper when rem sleep begins?

If a sleep researcher repeatedly wakes a person during REM (rapid eye movement) sleep, the individual may experience a phenomenon known as REM rebound. This occurs when the person eventually has the opportunity to sleep undisturbed, resulting in longer and more intense REM sleep episodes. Chronic deprivation of REM sleep can lead to cognitive impairments, mood disturbances, and increased stress levels, as REM sleep is critical for processing emotions and consolidating memories. Overall, the disruption of REM sleep can significantly affect an individual's overall well-being and cognitive function.