ds is 10 months, and has suddenly decided he wants to flip onto his front when put down to sleep. he has always slept ok, and goes to sleep no problem when put down on his back or side, up till now. he has suddenly kneeling up in his cot, but hasn't worked out that to go to sleep he needs to lie back down!!! he has been crawling for a while, but this has just started happening at nap and bedtime. last few nights he has been tired enough at bedtime, but once in his cot, he's all over the place pulling himself up and rocking about, that he's getting even more tired and worked up, and last night he howled for nearly an hour. this is so unlike him, as once put down and tucked in, he'd just go on his side a bit and go to sleep. he's in a grobag, but still loosely ptting a cellular blanket over as its quite cold at night. any advice on how to handle this much appreciated.