Use wearable accelerometer/HR monitoring for Smart Wakeup


As documented on the wearable page:

the ‘Advanced functions’ mentions:

Smart wake up works as good as with phone only

Are there any plans to make Smart Wakeup use wearable data?
What are the reasons to not be using this just for wakeup, but using it for sleep recording?

I bought Mi Band 2 and am wearing it during night.
One of the main reasons to buy it was to better detect my sleep phases and use Smart Wakeup feature.
I sleep with my spouse on a double bed and being able to use band’s accelerometer would be great as putting the phone on the mattress won’t give right results.
Otherwise I’ll have to buy armband for the phone and not use the mi band at all.

Thanks in advance