When you become a mom you just learn how to function sleep deprived and you do get used to it. I came back to work when Finley was three months old and the first few months were rough. Then somehow you learn to exist on no sleep and now when he does upon occasion sleep through the night which is like a full six hours you're pretty sure he's suffocating. So you don't sleep anyway.
I'd say that if you had a strained relationship with your mom for whatever reason the best thing to do is be open with each other talk it over try and work it out somehow as opposed to just putting a wall up and pushing them away.