Northern elephant seals sleep while drifting hundreds ... The secret to feeling good after a night's sleep may start during the day. Here are some tips on how to improve your sleep and feel ...

Primates, elephants, marine mammals ... who on average sleep about two hours a night. If their nightly sleep is disturbed — by predators, for example — they don’t need to catch up like ...

When the adults saw the elephant, they fled, but the girls, who were asleep, were left behind amid the commotion. The tusker trampled the girls to death, officials said.