That's likely the effect of gambling addiction as no gambler would just gamble all day, sometimes this addiction would not allow us to sleep since we don't have a peace of mind, therefore these addicts will try do drugs and drink so they can be calm and they'll be able to sleep when they are too drunk.
Actually, the idea also of getting drunk is to divert a gamblers mind put of the gambling so that he may go a day without even thinking about gambling. Gambling is one of the main reason why most people experience lack of sleep, because of the addiction they acquired or the idea of not having the peace of mind. Also, the addiction makes us to have a bad eating habit because we always want to skipped meals to play gambling. This gambling and health always has a connection in a person. The more you gamble, the more it affects you health hardly.
But of course, we also have those person who is more responsible in gambling. I think they always gamble but ofcourse look out for themselves also. And I think this kind of people existed but far from many person who existed to make themselves vulnerable to bad symptoms that gambling affevts in their healths.