Sleep API not working

[KamyarYazdani]

I am trying to add the new Fitbit sleep API to my app and I followed the exact instructions on the Fitbit API site (https://dev.fitbit.com/build/reference/device-api/sleep/). 

I put this in my app: 

import sleep from "sleep"

if (sleep) {
sleep.onchange = () => {
console.log(`User sleep state is: ${sleep!.state}`)
}
} else {
console.log("Sleep API not supported on this device, or no permission")
}

This does not work. The backtick in console.log is poorly placed and does not even build and when I remove the exclamation mark it keeps posting asleep when I am awake and wearing the watch. What is the problem?

[JonFitbit · Accepted solution]

You're right, that rogue exclamation mark is a TypeScript'ism, sorry.

The detection is a basic sleep classifier, but if you're moving it shouldn't think you're asleep. Are you sitting completely still when it reports you're asleep?

[KamyarYazdani]

It is just not super accurate. It is useful though as a point of reference among other variables. Thanks for your response Jon.