starving baby?

My almost 3 month old goes to bed at 10:30 after his night feed, pretty much every night. Well he doesn't wake up until 6 ish to eat next but today he woke up at 8! I thought that was a really long time to go without eating. 
He pooped so I was changing his diaper before feeding him and he was SCREAMING. like lose your breath kind of screaming, real tears, red face, etc. 
As soon as I gave him the boob he stopped and started going to town like he was starving. Should I be waking him up at night? I know you're not supposed to but he just seems starving in the am