Go-to Gadget
Strap on a handy wristband and app combo known as the Lark before you climb between the sheets, and in the a.m. you'll know how long it took you to fall asleep, how often you woke up during the night, and how many hours and minutes you slept. The Lark has a sensor that sends data to your iPhone all night. It sells for $129. Want a sleep coach? That'll cost you an extra $60 through the Lark's website.
