M.F.
Sounds like you're little guy is growing up! This is totally normal. He may get even faster at nursing as he gets bigger. At 3 months old, you shouldn't bother with waking him up to feed at night. If he wants to go all night, let him! You need the sleep too! Granted, your breasts will likely be bursting the first time this happens. Be sure you wear nursing pads to bed and have a pump handy to relieve the pressure.