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Ok, started brisket at 8:30 last night. Things were humming at about 250 and I went to bed about 11. Internal temp steadily rising (160 when I went to bed and 168 at midnight). Sometime around 3 am the internal temperature dropped to 158. I checked and the fire was out. Egg thermometer read 40-50 (outside temp was 40 degrees).
When I opened, the brisket was still "sizzling". Internal temp never dropped below 158. I wrapped in foil and put it in the over.