I get my entire flock in every night to protect them from coyotes. They come into a big yard with a loose housing shed on offer. This is a big chore as it curtails our social life, but it has many advantages. Actually, like most farm animals, the flock likes the routine of it, and comes in very willingly as the sun goes down.
I let them out at about 7am in the morning, any earlier and the predators are still out there predating!
I have LGDs and a llama, they like it too, it makes the sheep easier to protect.
Also, this means that we see every sheep and lamb twice a day walking around. This makes problems far easier to spot. If we need to get anyone out for treatment it easy to divert them into the handling area. If it is a sort day, or shearing, or dosing, the sheep are right there in the yard ready to go each morning.