When to feed newborn...

They say to feed your newborn every 2-3 hours. I do this during the day but was told by my PED I don’t need to wake him up during the night..

I don’t want to go past 3 hours so my question is:

He ate at 1245, played and stayed awake then fussed acting like he was hungry again at 145-2. Fell asleep at 245.

When do I count the 3 hour mark? When should I feed him again... I know they say don’t wake a baby but in my case he doesn’t sleep at all at night..

Please no judgements. FTM.