Help with night feedings!!

My baby is 1 month old and recently before bedtime I nurse him and he has been having longer feeds.

Due to this he doesn’t wake up as often (before it was every 2.5/3 hrs in the night). Now he wakes up every 4-6 hours.

Is this normal for his age and how can I relieve my leaking breasts as they are so full by that third hour?!?