Will not wake from sleep - Win 11 25H2

This problem started yesterday. No apps have been changed =- no alterations made or software changes.
PC goes to sleep as always at the required time etc. NOW neither the mouse or the keyboard will wake the PC
All the settings required are set as necessary - however, I noticed that items like hybrid sleep, and the fast startup options are now missing from the power menu.
I have to use the power button to restart the PC.
Have we again got a MS update problem to contend with?
Your comments welcomed - and thanks in advance for any help received.
25H2 (Build 26200.8737)
C

Did you by chance just update a graphics driver, especially NVIDIA? That's often a cause for sleep issues.

try changing the power profile. if your are on 'balanced' power profile change it to 'high performance'
then restart your system

then check the settings for that power profile and see if that gives any improvement.
best of luck Steve ..

Windows Update on some systems upgrades the UEFI firmware (aka BIOS). This might set the default settings affecting the sleep modes. Have a look at BIOS power settings as well as the Windows power settings.