DS has always been 'high needs' in relation to his sleeping. He still wakes up crying every day and has to have it very quiet, but he is getting better. His record was waking 21 times before midnight. He goes to bed in his own cot, but we co-sleep from his 1st waking.
Anyway to cut to the chase, this may be elementary for some, but it was an epiphany for me and has cut DS's waking down to just twice a night.....
BUY A SINGLE DUVET!!!
I still put him in his .5 tog grobag (don't want him to learn to climb out) but he seems to love the security of the duvet and his pillow (which he had already). He had a cot duvet which I didn't really use but was paper thin, this is a proper single one with a duvet cover that he helped me choose.
Hope this helps someone.