My LO is 9.5 weeks and in the last two weeks has started waking up anywhere between 20 and 40 min after being put down for the night. Varying the time he goes to bed, how much time he's napped, and how soon before sleep he eats a full meal (BF) seem to have no effect. I normally nurse him back to sleep for 20 min or so, but don't love this pattern. Last night I let him cry for a while (he just got more and more worked up until I couldn't take it) and tonight I tried sitting near him and helping him keep a pacifier in his mouth. He took it and sucked for 15 min or so but did not fall asleep. Eventually he had had enough of that and started screaming. Once he falls asleep the second time he is out for several hours. Has this happened to anyone else? What did you do to help get past it? Google has failed me.