Baby sleep

Baby is going to be one month old in a few days.. recently he has been grunting, stretching alot during sleep time.. which i feel affects his slp.. usually he slps about 1 hr++ but now due to the stretching he wakes up very quickly.. he tends to stay up quite long (1hr plus) too before he could fall back alseep.. How to make baby feel btr and have longer rest time?