sleeping through the night.

My 1 month old has gotten pretty close to sleeping through the entire night, only waking up once to feed. Tonight she didn't wake up at her Normal 4 hour mark so I woke her up to feed her like her pediatrician said. However I don't want to keep waking her if she's peacefully asleep and is ok. Should I just let her sleep? Has anyone else had a little one who sleeps almost all night so young?  she's also 23 inches long and 10lbs so she eats enough since she's grown since each appointment.