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?