I had this exact problem with my daughter, and the sleep deprivation was driving me crazy! Most likely, your baby is teething. You can try a couple of things to see if they help, and inspect his gums to see if there are any little teeth trying to peek through. There is teething rub on the market that helps numb the gums; you rub it on with a finger. They have "natural" ones as well as the regular standards. There are also teething toys you can keep in the freezer or refrigerator that the baby can put in his mouth and soothe the gums. What I did was cut the ends off of a very large peeled carrot that was very cold, and gave it to the baby to play with (I was there to watch, of course -- wouldn't leave baby alone with it). The color and taste was interesting and the coldness soothed the gums. Sometimes you just have to get through these periods, knowing that it will end someday, and your limits are much broader than you think they are. I used to say to myself, "I'm stronger than I think I am!" as I walked my baby in the night while she was teething (and at that age they are heavy!). I never recommend, as some do, to let the baby cry by himself in his crib at this age. If he is crying, it is for a reason, most likely teething pain. It is worth a little sacrifice on your part to help him be more comfortable. You might try massaging around the jaw line, too, and applying a cold compress to the jaws. It brings circulation to the gums and can help alleviate the pain (my pediatrician, who is now the president of the American Academy of Pediatrics, told me this). Good luck, and remember, this too shall pass. I would wait until he is around 2 years old to exert a little "tough love" about sleeping through the night. We had a "family bed" during this time in our children's lives, so it wasn't too much a problem; but that is a choice that is very individual so I don't necessarily recommend it unless you lean in that direction."