We tried it a few years ago, and it seemed to work.
The problem we had was that living in the Land of Ice and Snow, we were still checking in the middle of the night, just in case someone decided to have a night time calf. What was happening to us was that one of us would go out about 4 a.m., and see a cow in early labour. Well, you just can't go and jump back into bed when it's 25 below and you see that, so we'd sit up and wait for her to calf, and then sure enough about the time the sun came up, she'd do it. So there we were with a morning born calf, who most times didn't need any help anyway, and no sleep. :roll: :roll: :roll:
After we lost a few night's sleeps, the executive decision was made that the next year we'd go back to morning feeding. They still calve mostly in the daytime, with a lot of them calving towards supper time and early evening. That's a lot better for us.
I guess if you live somewhere warm, it's well worth a try.