Alcohol consumption disrupts sleep architecture, particularly REM sleep, and increases wakefulness in the latter half of the night.

“most of the research on alcohol indicates that it primarily affects two areas of sleep your sleep onset or the time it takes you to fall asleep and Sleep Quality which also includes the architecture of your different sleep stages”

“alcohol significantly impacts sleep architecture particularly by disrupting later stages of REM sleep and increasing wakefulness in the second half of the night”

“one of the most well-known and most robust effects of nighttime alcohol consumption is that it reduces the time it takes to fall asleep which is also known as sleep onset latency”

“one of the most well-known and most robust effects of nighttime alcohol consumption is that it reduces the time it takes to fall asleep which is also known as sleep onset latency... Alcohol also increases the total amount of nighttime awake wakenings in particular in the second half of the night this is also known as wake after sleep onset and it is one of the main ways that alcohol leads to more disrupted less consistent sleep”

“alcohol, it would surprise nobody to tell you that alcohol can make you fall asleep faster and actually sleep a little bit deeper in the very beginning of the night. Um, but the thing about alcohol is sorry for the fact that it's not good for you for all kinds of reasons. It gets out of your system very quickly. You metabolize it relatively quickly. And so what often happens with alcohol is when the alcohol leaves your system, it creates activation, creates a rebound. So often when people are drinking to fall asleep, they fall asleep fast, but then they wake up in the middle of the night and can't can't get back to sleep.”