deep sleep

The study found that the women who spent more time in deep sleep -- the third and deepest stage of sleep -- tended to have lower blood pressure than women who spent less time in this stage.

Still, Knutson said the results of the current study could guide future work that explores the underlying mechanisms that may be making deep sleep in particular more valuable for women.

In men, however, no comparable association between blood pressure and deep sleep was seen.

Scientists at Northwestern University are studying how short pulses of pink noise can enhance the slow brain waves of deep sleep.

Kabosu, whose nickname was Kabocha — Japanese for “pumpkin” — died Friday morning after she “fell into a deep sleep,” her owner wrote in Japanese in a blog post, which was computer-translated.