According to my Fitbit _(which I wear constantly)_, I get on average ~3h45m of "sleep". It apparently doesn't count restless as valid sleep, so it heavily eats into my sleep. Most of the ~8h chunk I'm asleep it marks as restless.. probably not a good sign lol.
Though, I don't think I'm using their new sleep phase metrics, as my Fitbit app doesn't seem to have it.