I specialize more in early intervention for autism, but this suggestion may help in your case. Basically, find a motivation for the child and make it fun or interesting to participate. So, if he has a particular interest in something (let's say, obsessed with multiplying numbers), make up a scenario that involves adding that interest into the firedrill. When you wake him up, be loving and happy. Tell him it's time for drills and multiplying! Hand him a card with a multiplication problem. After 10 feet, he'll get the answer and a high-five as the "master of the night-time multiplication drill" and after another 10 feet, he'll get another problem, etc. Practice it during the day a few times and remind him it will happen at night. Make it enjoyable, non-stressful, fun... Be imaginative. We have no idea how stressful the drills are to his sensory system -- or whatever other reason he may have for resisting. By using his motivations in a fun way, you are building up trust and hopefully the resistance will fade.