I would move the unit around the house with you wherever you spend most of your time. Although it is true that ozone will decompose rubber stuff like VCR belts, the output of the Enaly will not be strong enough to do this anytime soon. I would also use it sleeping, but start off very slow. Like I said earlier, too much ozone could make lung edema worse.
Use your nose as a guide. The nose detects ozone at around .01 to .03 ppm. The nose is also lazy and gets used to new smells rather quickly so that even though they have not gone away, they are no longer detected. this is why the dual-scent air deodorizers work so well to mask odors (although I would never recommend these chemical laden types of air treatments) After the ozonator has operated for a while in the room, go outside or to another area of the house for a few minutes and then re-enter the area where the machine is running. If you smell ozone faintly, it probably is not enough and can be turned up. If it is real strong and makes you want to hold your breath or cough, obviously turn it down. Any level will be therapeutic. More is not necessarily better. What you have to achieve is a balance of air purification/sterilization VS personal comfort and safety.
hope this helps,