According to the in Focus Box Titled "What You Really

According to the In Focus box titled "What You Really Want to Know About Sleep," which of the following is FALSE?

A) Yawning is typically followed by an increase in activity level.
B) Blind people frequently use sign language to "sleep sign" during sleep.
C) In a relatively common phenomenon called sleep paralysis, the paralysis of REM sleep carries over to the waking state for a short period of time.
D) Research has shown that increases in adenosine levels promote feelings of sleepiness.