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A nap that suddenly happens without your prior knowledge. The napper wakes up a few hours later feeling groggy and disheveled.

For example; I sat down on my futon to study and I woke up two hours later not realizing that I had fallen victim to a rogue nap.
I took a rogue nap after my shower today and woke up three hours later in my damp towel.
by Rogue nap victim October 28, 2013
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