Horses can sleep both lying down and standing up. They have a special system in their legs called the “stay apparatus” that allows them to lock their joints and rest without falling over, which helps them stay alert to predators in the wild.

Horses sleep better in a herd because they are social animals. They feel safer and more relaxed when they are in a herd. When you observe a herd, some horses will stand guard while others lie down to sleep, allowing them to take turns resting deeply. This natural behavior ensures their safety while still getting the rest they need.

Horses achieve REM (rapid eye movement) sleep when they are lying down. When they standing and resting they can’t enter REM sleep due to their muscles needing to relax completely. In order for a horse to lie down and get REM sleep, they must feel safe and comfortable enough to lie down. This happens when they’re in a secure environment or surrounded by a trusted herd.

Typically horses only need about 30–60 minutes of REM sleep in a 24-hour period to stay healthy and well-rested. This is achieved in short bursts.

If horses do not get adequate sleep this can cause sleep deprivation. Some symptoms of sleep deprivation can be: excessive yawning, increased irritability, reluctance to lie down, and can experience “sleep attacks” (sudden collapse due to exhaustion).

Sleep is an extremely important for people and animals. It helps boost the immune system, increases energy, lowers risks of injury due to stumbling or collapsing, increases performance, lowers anxiety and irritability, and more.

If you suspect your horse is suffering from sleep deprivation look at their environment and places for them lie down. Also, ask are they able to lie down due to physical issues. For additional help, talk with your Vet.