Copious amounts of beauty rest (up to 20 hours a day!) is a natural lion behavior that helps this iconic species preserve energy for when they really need it. Lions are crepuscular, meaning they are most active in twilight hours (between sunset and dusk and dawn and sunrise). Conserving energy during the warmer temperatures of the day gives lions an advantage over their prey, which are mainly species less active during the darker, cooler hours that lions thrive in. Additionally, like the majority of cat species, lion eyesight also improves in dimmer lighting.
Here are some male lions sleeping in quite unusual positions at Gir National Park, Gujarat, India.