Hangover effects on the next day could be source of unproductive work which is grossly neglected
The hangover lasts longer than you think - short science articles and news

Researchers have found that the cognitive effects of alcohol last on the next day even if there is no longer any alcohol in the blood. They found that the hangover effects on psychomotor speed, long and short-term memory and attention exists on the next day too which could impair the work performance. Although almost all workplaces have a strict policy related to alcohol intoxication at work, very few grasp the seriousness of the problem regarding the effects of the hangover the next day. It is estimated that the economic loss due to hangover based absenteeism is around 1.9 billion pounds per year.

Read the full story: University of Bath
Scientific publication: Addiction