#Yes brain it is over 75F outside. No we are not dying please stop making me collapse because it's a little warm thank you.

[beyondthetemples-ooc]

It's called a hypnogogic jerk! Basically the theory is that it happens when your brain notices your heart rate is dropping Too Quickly, so it jerks you awake with a panic response because it thinks you're dying and is trying to resuscitate you.