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Falling asleep in a potentially detrimental, dangerous or life threatening situation.
1) "Where were you when the fire alarm went off?"

"oh, i chose to have a danger sleep"

2) "mate, i woke up on the roundabout this morning..."

"you were totally having a danger sleep"

3)Having a "danger sleep" in the front row of class

4) "zzzz... (danger sleep)"
by Walter Willis November 02, 2010