Hi! DS is 11 weeks and mostly sleeps through the night. I have found that if I give him 6 oz at each of 2 feedings before bedtime he sleeps longer. Usually, he eats around 7 or 8pm and then again between 9 and 10pm. Last night he cried for a little bit in his bassinet but was sleeping by 11:30 and then did not wake to eat again until 7:30am. So far this is working. I hear you about being exhausted. I have been back to work for 2 weeks now and the nights that he wakes up make for REALLY long days. You will get through it. My suggestion: COFFEE!