B.O.
I have 7 kids and could never do the nails while they slept. I actually found it easier to do just 1 or 2 nails at a time and then let them go and play and do another couple. Sometimes it would take all day and sometimes it could take a couple days but it was less traumatic for them and less stressful for me. Eventually it became a game that I didn't want to do any cutting and they were running up and putting their hand in my hand and not wanting to leave until it was all done. They then thought they had they control. Funny how that makes such a difference.
Good Luck.
B. O