I’m in this situation too, I dont think men realise being a mum is a full time job too :/
You're definitely not asking too much. You should talk to your partner and work out something that works well for both of you so you're getting some rest and he's not feeling overwhelmed. I'm in a similar situation because my husband works 2 jobs and his only day off is Sunday. I typically let him sleep in because I know he doesn't sleep well throughout the week but I do wish I could sleep in sometimes, too. He helps out in other ways though. I could probably take a nap and have him watch the kids but I don't usually take advantage of that, haha.
Not asking too much. Not everything needs to fall on the mom. He can definitely help more.