When an alcoholic sleeps a lot, it can mean one or more things. A pattern of heavy alcohol use often correlates with daytime sleepiness. For instance, a study in 2014 found that roughly 15 percent of heavy drinkers experienced daytime sleepiness.
Alcohol consumption is also associated with higher rates of sleep disorders like insomnia and obstructive sleep apnea. People who suffer from these disorders are often sleepy during the day. They may take short cat naps throughout the day or frequently complain of being tired.
Worse yet, daytime sleepiness from a combination of alcohol consumption and sleep apnea reportedly raises the chances of being involved in a fatigue-related car accident.