Anyone else's babies suddenly sleeping a lot?

KE

My daughter hasn't slept more than 10-12 hours a day since she was born (she's almost 8 weeks old). She hardly ever naps during the day, if she does it's only 30-60 minutes. At night she'd sleep, at the most, 4 hours at a time. And she will not go to bed before 10:30pm no matter what I try.

For the past two nights she's been going to sleep around midnight and doesn't wake up to eat until about 8am. Then she'll snack and go back to sleep for another 3-5 hours. She's even started to nap more throughout the day. It's nice that she's sleeping more, but it's got me kind of worried that she just suddenly started to do this after almost 8 weeks of not sleeping well. She doesn't have a temperature, she's not acting sick, and she's gaining lots of weight. Am I worried over nothing? Ftm here lol