My 16 week old while he is sleeping will go from being in a dead sleep to a wailing baby. When we soothe him (picking him up and hugging <- I only pick him up when rubbing his back/belly doesn't help) he will stop. But the look on his face is pure fear, and it takes him awhile to get back to sleep. He is teething and if I rub my finger on his gums I can feel the tooth, so I'm not sure if it's teething pain waking him up or if it's truly a nightmare. Its happening more often (3-4 times today) and he isn't sleeping much during the day because of it. Any one having similar experiences or anyone have advice how to help him?