2 week old sleeping through the night.

Br

Some nights (like tonight) my two week old just sleeps. He wakes up and whimpers, but doesn't cry and when I put him on to nurse, he does for a few minutes and falls asleep. I'm having to set alarms to make sure he's eating at least every 4 hours. Any tips? He keeps falling back to sleep and I need him to eat! It's getting uncomfortable!