There is definitely a drift towards staying up later and later, and of course kids and/or work are not forgiving of that trend, so the sleep deprivation starts to accumulate again.

I guess just listening to what your body is telling you and not pushing it, especially if the reason is work (side-project or career), but even just staying up for something trivial like watching a movie or whatever. Maybe I can use a lack of dreams to tell when I've gone too far.