If you're an early riser and your significant other is a light sleeper, he or she may thank you for this gadget. The Lark Pro wristband silently wakes you by vibrating. The device, which pairs via Bluetooth to a mobile app, includes snooze settings, a backup alarm and sleep tracking. As it collects more information about your sleeping patterns, the app also helps you generate an action plan to sleep better and set sleep targets. Lark Pro is available today for $159.