Wake from Sleep

[Bill Metcalfe]

Recently, I have acquired a similar problem.
  I have an G4 AGP that I converted from 400 to 800. I added an 
additional internal HD shortly there after. The New HD was 
partitioned into OS 9 and OS X.2. All of this was months ago.
Several times in the past month I have noticed an odd phenomena. The 
machine will not sleep. I have had teenagers living in the same 
house. The lack of sleep does not seem to affect either. If I remove 
myself from the machine for a while, the inhouse screen saver comes 
on. If I then push any key, my desktop is restored, but, if I were to 
brush my fingers over the keyboard, touching several keys in 
succession, I also would be greeted with a message in 5 languages 
(which I hope is the same in all of the languages) and a dire warning 
that I must restart the machine. In fact, there is no option, the 
Computer must be restarted.  Other that this idiomatic gesture, I 
have noticed nothing unusual about the machine.