Well, that may be happening if a person won huge amount but if it's not a high or decent amount then that won't really happen. In my!own experience, when I won a decent amount is that I did sleep well and the complete opposite of what you have seen in the interview. To be honest, we all have different feelings in what we experience like winning in gambling or other stuff. If a person gets overexcited then that may happen right after winning and couldn't sleep once it's time to sleep especially the one who becomes a gambling addict.
I actually haven’t experienced this before, I am just like you - after winning whether huge or not I tend to sleep normally, there’s nothing that usually keeps me awake like the Op described it.
The only time I believe I would be awake and unable to sleep is if I manage to hit a jackpot that amount to a very huge sum, but for regular bets nah! I don’t think I’ll ever get insomnia from it. Normally, if you get a win that amount to something you’ve never seen before it should keep you think and that can cause insomnia or lack of sleep as well know it - that’s just the only scenario I can think of where winning can make you unable to sleep.