Why should lions get 15 hours a night and giraffes just 5... Lions are carnivores who eat huge amount of raw meat intermittently. They need lots of rest to sa

Why should lions get 15 hours a night and giraffes just 5... Lions are carnivores who eat huge amount of raw meat intermittently. They need lots of rest to save energy to digest that meat. Giraffes are herivores who must continuously eat just to get enough calories. They don't have much time to sleep. What's so difficult to understand?