Humans do very little when we sleep. This might not seem like a big deal, until you look to the dolphins as they sleep and swim with the pod. Or fur seals, who can sleep while watching out for sharks.
WCNC-TV Charlotte on MSN
Lions, bears, wolves and dolphins: Your sleep chronotype may determine when you should wake up
A new study shows your sleep chronotype can determine the best time to wake up.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback