My 7.5 mo has only slept through the night a handful of times. He used to wake only once or twice a night but for the past two weeks he been up 4-8 times a night. Usually he just needs his dummy and he'll go right back to sleep. When this started he had a cold but he now over that and still waking. I don't feed when he wakes and I only pick him up if he's really crying hard. Could it be the dummy? Should I try to get rid of it? If so how? Thanks!