Yup, I have a 9 mth old that did this - at ummm...about 6 or 7 mths? I nearly went nuts until I gave it up.

Now we have jammed the cot up next to our bed which is genius, why didn't we do that before! and he's much happier - if he gets restless I give him my hand and he holds onto my finger for a while till he goes back to being settled again!

DH worries about him crawling out, but I can't see it happening...yet! You could put the cot side up when you're not in bed, and down when you are perhaps?