Top Definition
That point of sleep where you realise that your arm is sticking out of bed and therefore susceptible to being grabbed by Freddy Krueger or similar that has been waiting under your bed until you fell asleep. Symptoms include leaping, gasping, rapid heart beat, withdrawing vulnerable arm, wrapping body tightly in protective bedsheets.

This syndrome was created by excessive watching of horror flicks, usually at a socially unacceptable age.
I was having the most amazing dream about an abandoned house then BOOM, got hit by a Krueger Sleeping Spasm, thought I was having a heart attack
by juicyjackie August 24, 2011

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