Having trouble waking up to feed

Kye

My baby is a little over a week old now and the past two days I’ve had trouble waking myself up at the 2.5 or 3 hour mark to feed him at night. He only woke me up 4ish hours after his last feed to eat by starting to cry just now. I know it’s pretty early not to be feeding on the recommended timetable. Any moms have tips on waking themselves up to feed their non-fussy sleepers?