Mias sleep changed about this time too. She was lucky to have an hour. Tho at 2.5 months he prob cant handle being awake for more than and hour, so it doesnt really matter how long he sleeps as long as he has a recharge. Im surre he would let u know if hes tired. I found this age hard, coz they arnt as interested in toys so its harder to keep them entertained while they are awake. Keep persisting, sounds like your doing a great job.. he will shock u one day when u expect him to wake up and he sleeps for hours lol. All bubs are different, so just go with his ques