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A disruption of sleep patterns caused by the inability to sleep one night due to the prolonged or excessive use of certain drugs, typically stimulants such as speed or coffee.

Similar to jet lag, only much harder to explain to loved ones.
"I did some speed on Saturday night. Now it's 6 am on Tuesday morning, and my drug lagged self is posting some stupid definition on"
by TwiceBjΓΈrnβ„’ January 17, 2005
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