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I believe those have power all the time and can be disabled via ecu timer. Therefore my lights would be on all the time until the ecu kills the circuit. I belive I found my answer in the FSM. An egr leakdown test is performed 5 hours after key off. It is used to detect any fuel vapor leakage via cracked lines or loose fuel caps. Time to find a new circuit. Perhaps the Radio/Amp circuit. will see how it behaves.

EDIT: I may be able to adjust the headlight circuit off delay to zero seconds using a techstream.
Yep... I was gonna say to turn the light timer off. If you got a 14 or newer you can do it from the radio.
 
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