The Brain's Secret to Sleeping Like a Log

"In this clamorous modern world, heavy sleepers have an advantage: They can snooze despite noisy neighbors and car alarms, and they're capable of conking out on a red-eye flight to awake refreshed and smiling.

But how do these sound sleepers do it? According to a neuroscience study published today in Current Biology, they're blessed with a type of brain activity that may essentially block out noise.

Sleep researchers from Harvard Medical School performed a slightly torturous experiment on 12...