15. Cats
Domestic cats are true sleep aficionados, often clocking up to 16 hours of rest each day. Their sleep is typically light and punctuated by short bursts of alertness, with one ear always twitching for the slightest sound.
This instinctive vigilance harks back to their wild ancestors, ensuring they’re always ready to pounce or flee if needed. It’s this blend of deep relaxation and readiness that makes cats such masterful nappers. Purina