As a general rule, waking or not waking a sleepy baby for feedings is conditional on his age, weight and overall health and wellness.

That said, we advise you to wake your little one up to nurse at regular intervals within the first two weeks of life, and afterwards, if he’s not eating properly at each feeding, if he’s not gaining weight and if he’s not wetting a minimum of 6 diapers per day, implying dehydration.

Nevertheless, it's basically fine to wait for your healthy sleeping newborn to wake up on his own for feedings.