Well I guess my sheep are badly neglected.
I now lamb only 25 ewes, all of whom have lambed before.
I only check 2 or 3 times a day, unless a ewe looks imminent , in which case I will keep checking as necessary.
Many years ago an old shepherd told me that his days of night time lambing were over, so he only lambed 2 crop ewes or older, which are many times less likely to have problems than a first timer. This certainly works. In addition, I now lamb my ewes outside which keeps them a lot fitter and less likely to have problems, and I do not feed them concentrates till they have lambed. They have good hay and a high energy/protein feed block ad lib and a ewe/lamb bucket (whose name I forget.)
My ewes are fit but not fat and have plenty of milk. The lambs are good sized, but not massive and since moving to this regime about 5 years ago I have rarely had to help a ewe - usually just the odd leg back which probably would have managed on it's own if I hadn't been there. Some years I haven't touched them at all. I lamb middle April to early May at which time there is plenty of fresh grass to bring the milk on, and get most of my lambs away August Sept, fat off grass.