Pink noise emphasizes lower frequencies — making it sound similar to steady rainfall or ocean waves. It’s often used for sleep.

For the first time, scientists have recorded brain activity in a free-ranging, wild marine mammal, revealing the sleep habits of elephant seals during the months they spend at sea. The new findings, ...

A team of scientists recorded the brain activity of diving elephant seals in the wild and mapped out the eccentric treks the animals take when they sleep mid-dive. Exactly when and where elephant ...