What effects of alcohol may bring on sleep but the agitation effect may cause a person to wake up?

Alcohol can initially promote sleepiness by depressing the central nervous system, leading to a quicker onset of sleep. However, as its effects wear off, alcohol can disrupt the sleep cycle, particularly during the REM stage, leading to increased wakefulness and agitation. This can result in fragmented sleep and feelings of restlessness, causing a person to wake up earlier than desired. Additionally, alcohol can cause dehydration and other physiological effects that contribute to sleep disturbances.