It all depends on what is running in your mind at that moment after making profits. Some, might want to gamble again believing that it's their lucky moment and wants to take advantage of it. I feel happy when I win and I sleep peacefully, due to arest of mind. Gambling shouldn't be something that will make you have a sleepless night. It's good that we practice a healthy gambling lifestyle.
Well, there's that situation where just because they are winning more money doesn't mean that they are still lucky which as you have said they want to take advantage of it which could also mean that they cannot sleep because they wanted to win more money. In my opinion, that's the kind of person who are greedy and doesn't have full self-control when they should have stop already since they won some money. If that's not what happening on their mind then they should have slept already.