@ftg@mastodon.radio for a given user (just me rn), head position and rotation deltas are checked if above a threshold and then used to either drive a value up linearly (when stationary) or down exponentially (when moving), so falling to sleep is a slow gradual detection (so it doesn't trip if e.g. someone is watching a video or reading something) but waking up is snappy and responsive it's relatively simple but it seems to work nicely :3 it'll trigger some convenient automations eventually