Olivia Has Trouble Sleeping for More Than Four Hours Each

Olivia has trouble sleeping for more than four hours each night. Which of the following is Olivia likely to experience?

A) more sleep spindles than people who sleep for a full eight hours
B) less deep sleep than people who sleep for a full eight hours
C) more vivid dreams than people who sleep for a full eight hours
D) less REM sleep than people who sleep for a full eight hours