If some people try to sleep after placing a bet, it is never possible. Especially until the result of the bet is settled, such restlessness or excitement will work in everyone. I have seen some gamblers who can lose money but wait for the result of a small amount of the bet. Here the different excitement of the gambler works, which has an effect until the result is determined.
Is it just about gambling? Humans have this call for 'we did it' players who stay awake love the sports and wants their team to win. With or without gaming, people cry over losing a game. Would you expect someone who loves his team dearly to grab some sleep while it's time to watch them play? So, I think this excitement is beyond winning money.