Question- Can you use the Xbox One (and plug and charge USB lead) to charge up the DualShock 4? I'm not keen on leaving the PS4 in rest mode overnight to charge the controller but the Xbone charges its controller even in powered off mode.
Should work. Rest mode is perfectly safe to use though, you can set it so it only supplies power to the USB ports for three hours which is more than enough time for the controller to charge. It won't actually be doing anything or using any significant amount of power unless there are files/updates to download.