Louisa has just drifted off to sleep on the sofa, and is almost immediately awakened by her mother who urges her to go to bed. Louisa insists that she was not sleeping, but is now terrified by the ghost that she is sure she has seen

Louisa is probably experiencing a(n):
a) hypnogogic hallucination.
b) hypnopompic jerk.
c) hypnopompic illusion.
d) nightmare.

ANS: A, Images that we experience as being very real just as we fall asleep are called hypnogogic hallucinations.