Any current through any device will dissipate current. If you don't have it then you have more voltage across the thing in sleep mode and so more current anyway. So while a diode will dissipate power it won't dissipate extra power.
Any current through any device will dissipate current. If you don't have it then you have more voltage across the thing in sleep mode and so more current anyway. So while a diode will dissipate power it won't dissipate extra power.