I've noticed that cattle mostly sleep in the early hours of the morning, up until just before dawn. Our main cattleyards are not that far from the house and we get some serious "moo music" when we're weaning calves. Usually though, they're quiet during those hours. Also, I've seen a steer curled up, so fast asleep, he didnt realise we'd gone by on bikes and taken all his mates.
He woke up with a big surprise, and looked around...huh???? On a balmy summer day, often after there's been good rain, they'll snooze very deeply to the extent you have to beep the horn on the bike to alert them to your presence. If cattle have been mustered, transported, jammed up in yards, sold through a sale, bustled about and then trucked again, you'll find they'll collapse in a heap first chance they get and have a good sleep, especially cows.
I just read that they only sleep about 4 hours a day...and in short time periods.
