the short answer is no. horses get fully functioning sleep standing up, however if they are in a situation where they feel completely safe with no threat they may opt to lay down. you will notice in a herd of horses if most of the herd is lying down there will always be a few standing, this helps them to feel safe and secure, as the horses that are alert will warn them of any approaching threat.
How do you know your pony doesn't sleep? Unless you're watching closely 24 hours a day, you might just miss him sleeping. I bet he does and you just haven't noticed. Horses usually sleep standing up. One of my horses fell asleep while the farrier was trimming his feet... his eyes closed, lip got loose and he was in zzzzz land. A horse also sleeps lying down but only if he feels safe and secure since lying down is a vulnerable position for a horse. I've read that horses only dream when they sleep lying down. If your pony doesn't have a herd, he may not feel lying down is safe.
Lying down.
Cows typically sleep lying down with their head straight or slightly raised, but it is not necessary for them to turn their head to sleep. They have the ability to rest and sleep comfortably in different positions.
Horses mostly sleep standing up. Horses do lie down occasionally, but most of the time they feel too vulnerable to do so. You will be more likely to see a horse lying down to sleep in a stable than out in a field. Horses live anywhere from stables to pastures, to islands. Also, some miniature horses have also been known to live inside their owners' home when used as therapy horses.
Yes, horses can sleep standing up due to a "stay apparatus" in their legs that allows them to lock their joints to remain upright. They do lie down for deeper sleep, but can nap while standing to quickly rest.
Fish sleep on the ground.
no. Horses only sleep deeply when they are lying down, which they do rarely. Horses mate standing up though. Most of the time, horses sleep lightly standing up and are easily roused. She'd just wake up and kick him in the balls.
Horses sleep standing up. Believe it or not, if they were to lay down for too long, their insides would collapse under their own weight. To accommodate this, they have a locking-type mechanism in their legs. That way, they can sleep and not fall over. But horses do take naps lying down. In fact, the only way they can get REM sleep is if they are laying down with their noses touching the ground.
Lying down.
Yes.
Horses will heavily doze standing up, but for sleep they must sleep laying down. Lighter sleep can be gotton with their legs curled up under them. They need only a few hours of deep REM sleep each week, and they can only get this laying flat out.