Frequently Asked Questions Syncing the SmartSleep and another device If you wonder whether you can sync multiple devices to your SmartSleep, please find here if we can answer your questions. Can I sync my SmartSleep and Fitbit? No, you cannot. Can I use a sleep device (Fitbit) for a baseline nights instead of SmartSleep? Not really, as they are measuring differently, one measures movement and the SmartSleep is measuring direct brain activity.