Night stop

Hi every one,
For 3 last nights, over night, desktop just stoped working, if I come in morning, move mouse, screen shows, every thing good, but I can't press any thing, just mouse moving and nothing more =\
I logged in via SSH, and I looked at top, Xorg loaded system 96-100 %.
What could it be ? =\
 
Screeensaver? Suspend/hibernate settings? BIOS power saving settings, spindown, etc?
 
And if I am somewhere for like an houre & than come back, move mouse & move mouse, it's all goof O_O
 
"And if so" ?

Repeating the symptoms doesn't do much. Looking into suggestions might.
 
It's not about your English, it's about the suggestions about BIOS, screensaver, etc. Look into those.
 
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