Weird sleep pattern

Anyone else’s little one sleep well the first half of the night then not at all?

My LO is 6 weeks today. He will sleep a solid stretch at first (like 11pm-3:30am tonight). He wakes up and I change, feed burp him and put him down. But he never settles back in. It’s 5;45 and he’s up again. Then he will fuss until about 8am then crash hard.

Normally I’d just sleep then but my 3 year old gets up between 7 and 8. So I get sleep thAt first chunk and then I’m awake the rest of the day.

I know he’s little and there’s really no schedule that newborns stick to, but anyone else going through this? Just settle back to sleep little man. This momma is tired!!!