Yes, horses do lay down to sleep, but it is less common for them to sleep in this position compared to standing up. Horses have a unique ability to sleep both standing up and laying down, and will choose their preferred position based on their level of comfort and sense of security in their environment.
standing ~MiniMuffin
Standing up sometimes laying down
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.
Arabian horses sleep like most other breeds of horses. Horses can doze on their feet and take little 'cat naps' throughout the day. They will spend a couple of hours on the ground sleeping in a 24 hour period. Most breeds of horses follow this same sleep/wake pattern.
Diumal. They have nothing to hunt in the night so they sleep. They position their rumps into the wind (if any), lock their joints, and sleep. Some older horses or retired racehorses may lay down to sleep and rest their joints.
Female horses sleep in the exact same places as male horses, neither sex has any one preferance when it comes to where they sleep.
Sea horses sleep by staying where they are
Sleep requirements are dependent mainly on age and activity level. A baby normally has around 12 to 14 hours sleep; a teenager (12- to 17-year-old) should have 9 to 10 hours; an adult can normally get away with 8 hours of sleep.Adults need 7-9 hours of sleep. If still tired they should sleep even more.normally eight hours
they sleep laying down
an adult need sleep of maximum 8 hours.
horses