G4 odor upon restart from sleep mode

My G4 functions fine but has recently developed an odor, upon just awakening from the sleep mode. The odor then dissipates and all computer functions are fine. Can anyone tell me the cause of this disorder? It only happens when awakening from sleep mode and not upon start-up.
G4   Mac OS 9.2.x  

Can you describe the odor?
Have you looked to see if something has crawled in and made a home. Your mac is warm even when off and some critters like the warmth.
After all, the term "bug in the computer" came from an actual insect that crawled into one of the old vaccuum tube computers and got fried.

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