Well, the disclaimer here is that I wrote that without giving it conscious thought, so I have to examine why I believe it retroactively. I notice that I'm pretty confident.

I think the biggest reason is just that it feels that way. The second is that I sometimes intent to go to bed, notice that I'm hungry, then eat something and go back to bed, and I seem to sleep better than average on those cases.

I've only tried to use it deliberately once. It was recently; I failed to fall asleep for about an hour, at which point I usually give up and just stay awake longer. Instead I got up, deliberately ate too much and went back to bed. It actually worked.