Fatal Familial Insomnia Is a Rare Genetic Disorder Afflicting Adults

Fatal familial insomnia is a rare genetic disorder afflicting adults in middle age. Sufferers

A) progressively sleep less and less, until they stop sleeping and ultimately die.
B) have no control over whether or not they will fall asleep most nights.
C) die from a lack of REM sleep, not from a lack of slow-wave sleep.
D) progressively sleep more and more, until they fall into a coma and die.