For at least a couple of months now my OH has been sleeping every night in a chair (usually fully dressed), refusing to come to bed and lie down. The nearest is getting him to sit on the end of the bed - but he falls asleep in the sitting position. Then, of course, he complains about a bad back. Recently he had to go for a brain scan and got as far as sitting on the scanner bench but refused to lay back and so they couldn't do the scan. Also about 2 months ago was when he had a fall and knocked himself unconscious. Does this add up to a fear of lying down? I haven't heard of it from anyone else but can't explain why he won't sleep in a bed. And if it is a fear, how to overcome it?