Do Horses Like Light at Night?

Horses who are used to falling asleep outside in the darkness may have trouble snoozing if they're moved to brightly lit stalls. They can eventually adapt to brighter conditions—broodmares kept under artificial light for extended periods of time show few adverse effects—but they will be sleepy until they do.

Do horses need dark at night?

Horses Have Excellent Night Vision

Horses do need about 15 minutes to adjust to darkness to be able to see adequately, so don't be so quick after turning the lights out to go mess about in the barn.

Do horses need darkness?

Artificial equine lighting can be used to spur a female horse to estrous quicker than normal. Mares need roughly 15 hours of constant light and 8 hours of darkness in order to maintain reproductive abilities.