Is this normal?

My daughter turned one month old today. Last night, she slept for almost 4 hours straight (woke up around 9). I fed her for about 10 minutes (that's her average feeding time), and she fell back asleep so my husband and I went to bed for the night. She woke up every few hours (like she normally does), but she didn't eat all that much when I tried to feed her. The first time or two she ate for a few minutes then stopped and she was too sleepy to wake up and try to continue to feed. The last couple times, she would keep popping on and off my breast every few seconds and barely got maybe a full minute of feeding before falling back asleep (imagine Hey-hey the chicken from Moana). Around 7:30 this morning she woke up and ate for about 4 minutes and fell back asleep and has been asleep for almost 2 hours. I'm kind of nervous that she's not eating enough.

I googled why this could be happening and an article I found said she could be figuring out that night time is for sleep and daytime is for eating, so I'm hoping she eats more throughout the day today.

This is also the first night that she's barely eaten like this. Usually she eats for 5-10 minutes each feed throughout the night. (I know the "average" feeding time is 10-20 minutes but my doctor said she's gaining healthy weight (2 pounds in her first 2 weeks) then if she only feed for 5-10 minutes then that's okay. I'm just nervous that she's barely eaten all night long...)