yes, I find that I do need to have at least 10 hours as well. My work is very accomodating for me at the moment and will let me catch up my time when I'm able to. (knock on wood) I am so glad my boss completely understands what i'm going through. Most days I get into work by 10 am, supposed to start at 8 am, but i'm in my bathroom mode from about 7 to 9:30 am. Or that I fell asleep again.
Or a couple of times a week, I wake up at 2 am and can't get back to sleep, not sure why that happens. But this are the times, when I fell back asleep and get up to rush to work.
My thought is our body is trying to tell us it's trying to heal and sleeping helps.