[silentbicycle]

For me, that usually just leads to insomnia. If I read anything remotely interesting within an hour or so of bed, it takes me a long time to wind down. YMMV.

When I'm stuck during the day, a context change (such as a gym break) often has the same effect though.

[philwelch]

Yeah, you have to get stuck enough to give up and want to sleep. Ordinary stuck does just keep you awake.