I had it on, turned it off, and now have it back on again.
I had this sort of feature on my Motorola Maxx and Turbo phones and loved it. This isn't quite as useful as Moto's version, but it's OK.
The problem for me is that if I do turn it off, there doesn't seem to be another way to use the S7E as a bedside clock. The Night Clock feature I just mentioned above is too small, and if I disable Always On, there isn't a Clock option in Daydream. I'd have to install a third party clock app to get a bedside clock displayed.
Have I missed something?