Long Stretch Too Late

BJ

My son will be 4 months in a couple weeks and I believe he is going through a leap or maybe regression.

He seems to get his longest stretch of sleep from 3am until 8 or 9. How can I change this because I work and would love for him to do his longer stretch when he first goes to bed. I end up having to wake him for daycare and I’m left sleep deprived.