Anonymous9 years ago000I always put my smartphone in flight mode overnight, so the activity tracker would not have a Bluetooth connection. Will it still record my sleep? Thank you very much for an answer.Show in original language (German)David Mele9 years ago+110 Helpful answerHello Anon, Yes, sleep is recorded. The fitbit syncs with your smartphone as soon as it has an active connection again. Greetings DaveShow in original language (German)Comment1 comment