I can agree to it because I experienced it before.
I have 2 reasons before:
1. It's either I can't sleep because I am excited about how to spend my winnings

2. Or I can't sleep because my winnings are not enough and I am still willing to play more, bet more, and expect to grow those winnings.
I think the number 2 is fairly a bad idea lol.
I think it would be safer if you just keep your money if you win big and don't gamble at least for a few days. Enjoy that money for a while because you don't get it win that kind of amount too often. If you're aiming to buy something or spend on something but the winning ain't enough, you can always add something out from your pocket. It's safer that way that going back to gamble to try and add something more to that winning.