@ZombieAttack
He also hates having his fingernails cut
Something that really helped ds (who is very resistant to anything to do with self care, and has lots of sensory issues) was to squeeze the end of his finger for 3 or 4 seconds before cutting his nails...it seemed to really help with the sensation. It also took us an age to realise he hated nailclippers, and scissors were better, and to set a visual timer - so I would say this is going to take 3 minutes, and if I hadn't finished I'd just stop.
I don't know if any of that would help - I always ended up waking him up if I tried to do it in his sleep (and that was a HUGE disaster!!)