Streamer always on?


I just obtained a new streamer (Arcam.) 
Should  the power always be left on, or turned off when not using?
128x128rvpiano
My Node2 has been on for the past 2 years....Actually, it doesn't even have an on/off switch.
I power down my Node2i at night before bed. You hold the play / pause in the center of the top control for 3 seconds to power it down. 
djones51.
Is that a new feature of the Node2i? Can you do that with the older Node2?