I had a friend who use to play the gambling only when he consumed drugs,Sometimes he use yo win the money.But most of the time he loss the funds,
When a gambler gambles under the influence of alcohol or drugs, it has the ability to affect their decision making. Drugs, alcohol or substance use in gambling can make a gambler over gamble, go over their budget, chase a loss, and be totally numb to feeling the effect of losing.
In casinos where free alcohol are served to customers who are gambling, the gamblers will most likely gamble more even without knowing.
As for the sleep aspect it is even logical to conclude that such a person is an addict because the big question is why would someone feel sleepy and still continue to gamble.