Big hugs Amber, you are doing a great job! I know how hard the sleep deprivation thing is, it's sooo draining.

How do you settle M when he's in his cot? Does he settle if you pat him? The reason I ask is, could you try sleeping in his room for a few nights (maybe put a mattress on the floor?) and whenever he wakes you could just reach over and pat him (or whatever it is that works for him) off to sleep? This may help him to go through to the next sleep cycle by himself. I did this with K during the day because he would only do one 40 minute cycle for a nap, and he eventually worked out how to sleep through the cycle all by himself.

I really hope you find something that works for you soon