Everyone’s looking for a better night’s shut-eye. Each morning, many of us wake up groggy-eyed, promising ourselves, “Tonight, I’m actually going to sleep at an early time.” And sometimes we do, and sometimes we don’t. Sometimes we sleep terribly; sometimes we think we’ve slept well but still feel iffy the next day. And when it comes to actually tracking our sleep, it’s not always easy to interpret the data, let alone know how to improve.
