It could be he is waking up to crawl, as you mentioned, or separation anxiety, both will pass soon. DS is a little older than your LO and he recently started having separation anxiety at night, lasted for about 4 nights, then gone. He is also a 7-7 sleeper. The only reasons he has ever woken at night were teething when the teeth actually poked through the gums, waking up to practice crawling, waking to practice standing, separation anxiety. The only way I could tell it was separation anxiety was that he cried the same way as during the day when I would go out of sight. As soon as I came in his room and layed him back down he went back to sleep for the rest of the night, except for one night in the middle when he woke twice. The only difference is DS was waking at about 10pm, not early morning. Do you have blackout shades in his room? It could be early morning light. We put a piece of cardboard in both windows and it is totally dark in DS's room. HTH