In alcoholic terms, a demilitarized zone (DMZ) is the time period, usually the frontier or boundary between the state of drunkeness and hangoverness, where the mind feels fresh and unaffected by acohol. This period usually occurs at a few hours after dawn, and lasts for only a short period of time. During the demilitarized zone, one can get out of bed and walk around without feeling the affects of alcohol, like vomiting and extreme headaches.
Yo man, I woke up this morning at 7am, and I felt awesome. I must have just caught the demilitarized zone. 30 minutes later I couldn't stand up without having to vomit.