How´s My Sleep?: Personal sleep trackers are gaining in popularity, but their accuracy is still open to debate.

When it comes to health and fitness, there´s an app for just about everything. Want to track how many steps you´ve taken today? There´s an app for that. Want to track the calories you´ve consumed? There´s an app for that, too. And, if you want to know if you got a good night´s sleep last night, well, now there´s also an app for that.