My 10 month old son was sleeping through the night until about a week and a half ago, and now every night since the night is restless for the whole family. Some nights he could wake up 4 times, and other night it is practically impossible to get him to go back to sleep in his crib. He wakes up hysterical so every night either my husband and i get him and he will settle down as soon as we hold him, but as soon as we put him back in his crib he is hysterical again. It takes us holding him for about 20 min till he is in a deep sleep before he will easily go back in his crib. We have tried letting him cry, but he just gets more and more hysterical and we don't last more than 15 min before getting him. I am at a lost on what to do, obviously getting him during the night is not solving the problem.