This is one of the reasons I stopped breeding. I am gone 7:30-4:00. If the mares' bags were at all tight in the morning, I'd call my father, who lives two miles away, and he'd pop over to check on them. If he thought they were close, he'd stay. Or he'd returen every two hours. He's a farmer and did a lot of calving, but I told him about red bags and the best way to pull a foal if a mare needed help. The vet's number and all foaling supplies were handy. I also had permission from the principal to scoot if I got a call--not easy to do with a classroom full of kids--I had to arrange coverage. But the foal would have arrived long before I'd get home.
When I was more unsure about when the foals would come, it was torture to stay up most the night and teach the next day. It was hard to stay awake at stop lights on the way home. Dangerous. My body took months to adjust back to normal after a week of so little sleep for the first foal, then to repeat it for the second.
Not one of my six foals ever came during the day. Whew! Two foals arrived every other year here, and by the 3rd time around I could pinpoint the night those mares would foal. When I came home from work--if their bags were tight and the milk honey like or had turned to skim--that was the night. Whether 9 PM or 2 AM, I knew it was the night. I always took at least the morning off the next day--for the vet to come check things out and to know the foal was fine. Usually I hadn't slept--so I often took the whole day to fit in a nap to avoid the crash.
Leaving for work when there are new foals--that's another tough one!!!