Hey Snowball. I know exactly how you feel. Before I got pregnant, I wasn't much of a sleeper. Now I sleep at least 10 hours every night and normally need a nap (or two or three) a day. I don't like being this sign, but our bodies are working the hardest they will ever work in our lives.
I've had a few days recently when I don't need a nap at all. Right now I am very very tired, I feel like if I don't go to sleep soon I'll drop (and OH doesn't get in from work until 8.30 so I have to cook dinner etc) I find it really surprising how tiring pregnancy is. I didn't expect this at all

I also find the more tired I am the more nauseous I feel. And hungry too, lol.