Body clock

I think my body clock is ruined. Especially after the last 6 or so months.
I've been going to bed later, and waking up later in the day. It's not good really. On some days, I go to sleep later, and wake up early, or on time. Meaning I'm loosing out on sleep all round...It's not good, at all. Ah well. I suppose I can only try to make it right again.