I recently bought a new Motorola XT1921 (Moto E5 Play). I have gone into settings and changed the Sleep setting. I have set up Attentive Display, which is basically useless, because the phone can barely "see." I have gone into the Security settings and set Smart Lock to activate On-body protection AND added my home address to Trusted Places. It STILL goes to sleep within 5 seconds. I'm at my wit's end as the ONLY solution I've found so far is to keep it on by constantly moving my finger on the screen, which isn't always feasible.

 

Already did that. Reread my post. But thanks.