Area-51 AAT2250, 5090 clicking in Sleep Mode

Just got my Area-51 desktop a couple of days ago.  Generally love it!   It's Huuuuge, but speedy.

One issue that concerns me is that when the unit is in sleep mode, it will periodically "click" and the GPU light will come on. 

I've read from other threads that this is probably the PSU waking up periodically and checking for LAN traffic.

Can others with the new Area-51 desktop confirm that this is "normal" operating behavior and I shouldn't be worried that something is wrong with the PSU or the desktop in general.  I know the easiest solution is to disable sleep mode, but wondering if there are any other resolutions to this issue.

Wanting to make sure I'm not causing any potential damage.  The unit is also plugged into a UPS as well.