After I posted this open forum, I found a response from “SteveH” member and i tried it last night. He said this:
It can't calculate a sleep score without the sleep stages information. Fitbit say:
"There are a few scenarios where you might see your sleep pattern (which shows your time asleep, restless, and awake) instead of sleep stages:
- If you slept in a position that prevented your device from getting a consistent heart-rate reading or wore it too loosely. For best results, wear your device higher on your wrist (about 2-3 finger widths above your wrist bone). The band should feel secure but not too tight.
- If you used the Begin Sleep Now option in the Fitbit app (instead of simply wearing your device to bed). For more information on automatic sleep tracking, see How do I track my sleep?
- If you slept for less than 3 hours.
- If your device’s battery is critically low.
For more information about why you see your sleep pattern, tap or click the sleep record that shows your sleep pattern."
basically, I’ve been using the “begin sleep” function on my app (I’m a newbie) and I didn’t know the Fitbit will automatically start tracking it. Last night, i just wore it to sleep without using “Begin Sleep” and it works this morning. I also changed my sleep settings from “sensitive” to “normal” since sensitive was too sensitive, it was recording too little sleep so a score can’t be calculated. Hopefully it resolves other’s situation as well.
