Use of additional watch metrics (on Wear OS) to detect sleep

During the night, I might get up to walk to kids bedroom etc, but Sleep as Android is not picking this up as a wake, despite the fact I might walk 10 metres or so.

I would have thought that HR would pick this up, but I guess there is a delay to HR and it is only read periodically.

Can the app be made to also detect other sensors - like step counters or whatever else might help detect a physical significant movement (vs an awake and remaining in bed)?