Also, would someone happen to have tips for dealing with grad-school-level time pressures while maintaining a healthy sleep schedule?

I happen to have a) grad-school level time pressures, and b) a healthy sleep schedule. I'd never have done it own my own, it just worked out because I had a bunch of kids. But the kids are actually incidental. What kids do is make it so you get up at the same time every day, because once they're up, they find some way to destroy your house or kill themselves in 20 min. So you have to get up.

What I learned from all this, what I wished I'd known all along, was that the amount of sleep you get is, within reason, not that important. What matters is getting up and going to bed at exactly the same time every day, even on weekends.