The $230 Polar Ignite coaches you based on how well you rest. Experience a new dimension of fitness with the Active Edge. This cutting-edge wearable is equipped with remarkable features that enhance your training and
More than a third of Americans have used a device to monitor sleep, according to a recent survey from the American Academy of Sleep Medicine. But while experts say the devices can offer a sense of what's happening while you sleep, they also have limitations. Here's what to know about using a device to track your sleep.