Why does a muscle hurt and feel sore after getting a shot?

How does one get cramps while they are immobile, for instance laying in bed, when they aren't doing any strenuous exercise to stimulate any cramps?

http://www.webmd.com/pain-management/muscle-spasms-cramps-charley-horse

What causes a person to sleep with their eyes open?

How did "Kiss Feeding" Evolve from a source of nourishment into a Sexualized kiss?

Does Drinking Pop Ease Sore Muscles?

Is there any evidence that drinking soda pop after a workout speeds relief from sore muscles by speeding the breakdown of lactic acid?

Carpal Tunnel Syndrome

What is carpal tunnel syndrome, and what exactly is done during carpal tunnel surgery to correct it?

seizures

What exactly is it about drugs, medical and recreation, that causes the seizure? Why would they release something so risky to the people no matter how helpful it would be?