I was originally the type of person who would "sleep flat on my back without moving a muscle." I probably have a deep sleep, ...

In a reward-free touchscreen game, Japanese macaques favored a button that made a puppet pop up in somewhat unpredictable spots, like curious humans. Six zoo orangutans heard laughter before learning ...

In the middle of the night, a sudden, sharp pain shoots through your calf.You involuntarily cry out and jump out of bed.Even ...

You're sound asleep when it hits-that stabbing pain in your calf that yanks you out of your dreams and leaves you rocking ...

Nearly everyone knows the feeling - you're fast asleep until being awoken by a sudden crippling pain in your leg. It's often a jarring sensation: a sudden cramping in your calf that wakes you up, ...