[wpietri]

Mostly by going to bed earlier and by having a wake-up time that normally gives me plenty of time in the morning. Also by being comfortable with biphasic sleep, where I might be up for 90 minutes in the middle of the night. (That appears to be the natural human sleep cycle; an uninterrupted 8 hours became the standard only once electric light became common.) And occasionally by taking an afternoon nap.

On the rare occasions when I have something pretty early that I absolutely have to be awake for, I'll use a sleep-cycle-sensitive alarm. I use the one in my Pebble, but there are plenty of others.