I wrapped my DS until nearly 1. I had to stop as it was just too hot for him in the summer. We went cold turkey and it was about 2 weeks of continueous 1-2 hourly night waking. Its wasnt nice for any of us but i just couldnt see any other way as it was just way too hot and he also was getting frustrated with it and unwrapping himself. I would just keep going into his room and pat and stroke him back to sleep.
I will say though that for this baby i probably wont wrap past 8 months. Just my opinion but i felt it was so much harder with a 1 yo as he 'knew more' if that makes sense?