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> Do the chicken go back in to sleep before dusk?

Yes - they are remarkably consistent in following the sun. Most automated doors wait until well past dusk, after which all the birds are up.

> Do the predators never attack during the day?

Raccoons and hawks are the predators I have had to worry about the most. Of them, raccoons are primarily nocturnal, and hawks are best dealt with by having plenty of covered spaces in your run and a rooster to watch the skies.