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1.
The feeling when you lay down on your bed after being so tired and yet can't fall asleep because it feels too good.

A very good feeling when you're going to sleep on your bed after a long day of hard work.
Sam is suffering from hyperextensivesensation last night and can barely stay awake today.

"Aww man, I get hyperextensivesensation everytime I hit the bed."
by EpicCrisis April 14, 2013
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