DS is 3 months. He's been sleeping through the night 9 hours since he was about 1 month with the occasional middle of the night wake. But for the past few days he's been waking up after about an hour and then won't stop screaming for hours on end, Last night he Basically screamed from 10 pm til 4 am. I tried feeding him, tried gas drops, nothing calmed him. Then he fell asleep and woke an hour later for his usual feed and now seems fine. What could this be? Not a growth spurt becaus he wouldn't eat, could be teething so soon? Another thought I had is that he's in our room, and perhaps now that he's older and more aware of his surroundings that we are waking him up ( he's in our room) and hes getting overtired...I do notice he wakes more easily from his naps during the day when the phone rings and it's harder to put him down for naps. Thank you for your help, sorry about any spelling or grammar issues as I did not get any sleep. :(