Final answer:
Sleep deprivation can lead to various negative effects on an individual's physical and mental well-being. The effects can occur quickly and are particularly severe when there is a significant lack of sleep. REM deprivation can also have negative consequences on emotional regulation.
Step-by-step explanation:
Sleep deprivation can have various effects on an individual. It can lead to depression-like symptoms, obesity, increased blood pressure, increased levels of stress hormones, and reduced immune functioning. The effects of sleep deprivation can occur quickly, with cognitive and motor function impairments similar to alcohol intoxication. These effects are most severe when a person stays awake for more than 24 hours or experiences repeated nights with fewer than four hours of sleep. REM deprivation can also have negative effects, including emotional regulation difficulties.