My sleeping habits have been a mess for a long time. Over a month ago, I've decided that enough was enough and bought a calendar, pinned it on a wall, and decided that I'd have to wake up before 8 every day no matter what (I know it seems like nothing for most people, but it was challenging at first for me, one of the caveat of being able to work when I want and being a night owl =p). After waking up, I just put a checkmark and the calendar.
A month in, I'm falling asleep and at a regular time, I have way more motivation to follow my exercising routine, I am more focused and motivated in my work as well.
So I couldn't agree more, sometimes a little change can have a huge effect.