PS Audio P5 - leave on or power off when done listening?

This is my 1st regenerator, and as the title suggests, I’m looking for input on whether or not I should be powering down the P5 unit itself or just the audio devices plugged into the p5 regenerator?

for reference, I have a devialet d200, oppo CD player, and Apple TV as the only devices that are connected. 

Thanks,

mike