DS is almost 15 months old and has never slept through the night. I usually nurse him and put him back to bed. Lately, he hasn't been able to go back to sleep after he nurses. He then stays up in his crib on his own for 1+ hrs. I watch him on the monitor and I see that he is trying to get comfy, settle down, go back to sleep but he isn't able to. He then cries after about an hour, I come back and try and help him fall back asleep (nurse him again, rub his back, occasionally hold him, etc etc). It frequently happens during his midnight/1am feeding and 90% of the time for his 4am/5am feeding. I am incredibly sleep-deprived and I try to wake up at 4am to cook breakfasts, lunches, etc for my other kids and I can get nothing done. I haven't gotten more than 5 hours of broken sleep in weeks and I am absolutely exhausted. Let me add that I have never rocked him to sleep and put him awake in his crib since birth (99% of the time). He usually goes to bed at 7-7:30pm. He takes one nap around 11am for 1.5hrs-3hrs, usually around 2 hours. What am I missing here to help him sleep better? I am so desperate for help and ideas!