are you able to co-sleep? I found I didn't notice soo much once we were co-sleeping and at your DS's age it is a lot easier to co-sleep. Could he be teething? sick? going through a wonder week/growth spurt? I usually find there is a reason why DS would have mammoth feeding/comfort sessions which ususally didn't make sense for a few days and then a new tooth would pop through or he would be sick or he would start doing something new.

If you can sleep when he does today it's the only way I survived