Making all my milk at night?

Hi! Baby is 3 months tomorrow and I have been EP since week 2! Over the past few weeks I have made less and less milk during the day. No matter how often I pump I don’t make more than 3 oz total until about 9 pm when I make 7-8 oz per pump until the morning. I am keeping up with how much she is eating just not sure why it’s jumping up so much at night. Is that normal? Is it bad if I go more than 3 hours between pumps during the day since I’m not feeling full that quickly? I am so confused!!