The human body is one of the most incredible organisms in the known universe, but all that awesomeness carries some pretty weird and hard-to-explain baggage. We are here to help shed light on some of those body mysteries in the hopes you'll have something intelligent to say if you get stuck in an intense debate about the pee shakes or the white thing you just coughed up. Read on, get educated and help identify those unknown moments when it appears your body is rebelling against you. If you're lucky your questions will be answered here, if they aren't ... brain tumor.
Falling In Your Sleep (aka The Hypnic Jerk)
This is that falling sensation and sudden jolt you sometimes feel just as you're falling asleep. Scientifically named hypnagogic myoclonic twitch, it's also the third leading cause for embarrassment on sleepovers, behind bed-wetting and sleep farting. The muscle spasm may be light enough to be misinterpreted as a dream or it can be so jarring it physically shakes you awake.
What causes it?
Like any good freakish event, the experts can't agree on what causes it. Most researchers feel that when muscles begin to slack while preparing for sleep the brain senses and misinterprets the relaxation signals, and assumes the body is falling. A little presumptuous on the brain's part to go around "assuming" you're falling while lying down. Then again it's nice to know the most important organ is on the lookout for trapped doors with mattresses on top.
If you want to experience this feeling at your desk just lean back in your chair, a little past the point of no return. Once gravity reminds you who's boss your body enters that frenzied states of "lost-balance/I hope that girl I like isn't watching." The sensations are so physically comparable that the brain analyzes them the same.
Pee Shivers (aka Post-Micturition Convulsion Syndrome)
Commonly known as the "Pee Shakes" or if you're an adult, the "Piss Shivers." It's a tingling sensation down the spine which causes an involuntary twitch. Also it is the best excuse to use if you happen to piss on your urinal neighbor's shoes while drunk. The uncontrollable shaking is similar to the prolonged shivering someone experiences when very cold, however others have reported it feels like a miniature orgasm. Researchers have since decided to keep golden shower enthusiasts out of their surveys.
According to research, 83 percent of males say they've experienced this, but only 58 percent of females have gotten the shivers--probably the whole "standing vs. sitting" thing.
What causes it?
Inadequate government funding toward piss-related mysteries has lead to several "educated guesses" as to why the shaking occurs. Some have offered a highly technical and uninteresting explanation involving changes in the nervous system when the bladder is relaxed.
The simplest explanation, though, is that the rapid release of warm fluid lowers the body's overall temperature leaving it to react the same way you would in a cold breeze. Why you don't shake when vomiting or giving blood was not answered, because those particular researchers apparently decided they had thought about it long enough.