Windows 11 sleep issues

Whenever I use sleep on my PC (using the Power menu) the screens go off as expected then one comes back on a few seconds later and stays on, and I can't find a way of getting it to stay off. I've tried searching for solutions but they all seem to involve settings no longer in Windows 11 or that they have have been moved and I can't find them.

I've tried disabling Wake On LAN.

I've also set up Windows Hello to see if that helped, but as soon as I put the PC to sleep (from the power menu) the web cam starts flashing and looking for me, I also set it to go to sleep after 5 mins of inactivity but it doesn't.

It's a new PC - Asus ROG NUC (2025) running Windows 11 Home which is fully updated. 

Edition: Windows 11 Home

Version: 25H2

Installed on: 31/‎07/‎2026

OS Build: 26200.8973

Experience: Windows Feature Experience Pack 1000.26100.344.0

I have a wireless keyboard and wired mouse connected to a KVM switch (so if i want to use a laptop which is normally off I can with the same keyboard/mouse), and 2 monitors connected to two HDMI on the PC.

Any ideas?

Cheers