The most common short-term effect of alcohol abuse is a hangover. This term describes a group of symptoms experienced by a person after heavy consumption of alcohol. These symptoms often include nausea, fatigue, thirst, headache, diarrhea, and sensitivity to light and noise. The severity of the hangover depends on several factors, including the amount of alcohol consumed, the level of hydration in the body at the time of alcohol consumption, and disease.
However, a hangover is only one of the many short-term effects of alcohol abuse. Other problems that can develop include:
"The most common short-term effect of alcohol abuse is a hangover."
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Low doses of alcohol (one 360 ml (13 imp fl oz; 12 US fl oz) beer ) appear to increase total sleep time and reduce awakening during the night. The sleep-promoting benefits of alcohol dissipate at moderate and higher doses of alcohol.  Previous experience with alcohol also influences the extent to which alcohol positively or negatively affects sleep. Under free-choice conditions, in which subjects chose between drinking alcohol or water, inexperienced drinkers were sedated while experienced drinkers were stimulated following alcohol consumption.  In insomniacs , moderate doses of alcohol improve sleep maintenance.