Sleep crawling

[sconeonamission]

Hi.
DS is 5mths (and a week) and as soon as we hit the 5mth mark, he was crawling (or doing his best to copy the action). He pulls his knees up, looks around, puts his face to the floor and pushes off. He gets around pretty quickly and goes far enough. However, he's now doing it in his cot too. 3 times in an hour and a half tonight from midnight, he was crying/ screaming for help, but was still asleep, trying to keep crawling into the end of the cot. Other times, he just rolls around and ends up with his head in the corner or face planted into the side of the cot. Or wakes up coz he's freaked himself out by being on his stomach and pushing up. Only did that a few times before the crawling happened. No wait... did it again tonight.

Tonight, I rescued him from crawling in the corner of his cot and popped him onto our bed (I really needed to pee lol), woke DH up to make sure DS didn't roll off the bed. DS just rolled over and kept trying to crawl! Didn't wake once.

Now, he's still asleep when he starts crying just needs to be picked and cuddled for a few mins and he's right to go back into the cot. Is there any way to stop him from crawling in his sleep? Or at least to stop himself from getting to a point where he needs help? What can I do?

That said, I've been up since 130 (now 330) and he's just done it again!

Any tips or ideas?