Yes, cows do sleep. They spend about 4 hours a day lying down to rest and sleep, often in short intervals throughout the day and night.
Elephants do not lie down and sleep. They sleep standing. You know why? They are afraid ants might get into their trunks
Lying down.
Laying down.
Fish sleep on the ground.
Lying down.
Yes.
Yes they can, and in fact a horse can only get REM sleep by laying down.
Because they need to rest their feet legs and ruminate, and also to catch some sleep.
Standing up or lying down.
Lying down.
No. Cows are not built to sleep standing up like horses are. Because cows are heavy in the brisket and barrel area, holding all that weight with fat, muscle, four-chambered stomach and other organs, they choose to lay down to sleep instead of remaining standing. They do doze, however when they are standing up, but it is only a light doze, not a sleep.