My 6 month DS has been a really good sleeper, going through the night from 10 weeks (sorry!). Although he doesn't roll over yet he has learnt to "scoot" himself backwards on his back. Not a problem during the day, but the last few mornings he has woken up between 5.30 and 6 and wriggled himself backwards into the corner of the cot at which point he gets very frustrated and starts screaming. Moving him back down the cot doesn't work as he just scoots back again. I suspect that he has often woken this early in the past, but he used to happily go off back to sleep until about 7. He sleeps in a sleeping bag, so isn't screaming because he is cold.
Does anyone have any idea how to discourage this?