MY FIRST GLIMPSE of Royal Caribbean’s Icon of the Seas, from the window of an approaching Miami cab, brings on a feeling of vertigo, nausea, amazement, and distress. I shut my eyes in defense, as my ...

“We record an amazing number of signals when we study sleep,” co-senior researcher Dr. Emmanuel Mignot, a professor of sleep ...

If you use a third-party sleep tracker with your Apple Watch, you’re probably familiar with the concept of a sleep score: an index that combines signals like heart rate variation and sleep stages, to ...

In addition to helping you count steps and keep track of your heart rate, your FItbit is also a full-featured sleep tracker that’s easy to set up and use. Sleep experts note that sleep trackers can ...

In addition to telling time, measuring your workouts, and delivering texts or emails, the Apple Watch is also a very solid sleep tracker with an interface that’s easy to set up and use. Why would you ...