I'm 5 + 3 so very early on but my god, I'm so very tired. I only work 18 hours so can't blame it on work but all I want to is sleep. I'm averaging 11 hours a night and still feel like I've been hit over the head with a steam roller. I think I could sleep all day (and only wake for meals) and still be tired!
I don't remember being this tired with DC1 (who is 5) either.