Dataset with accelerometer and heart rate and sleep stage

[KamyarYazdani]

I wanted to extract the sleep stage of the fitbit alta HR in real time but there is apparently no way to access that data. Therefore, knowing I can access the accelerometer and heart rate data, I want to come up with my own algorithm to calculate that. Is there a dataset containing heart rate and accelerometer and sleep stage data to do such a thing?

Thanks

[JonFitbit]

Unfortunately, you can't build apps which run on the Alta devices, so you can only get data from the Web APIs and those aren't real-time.