Imagine We Found That Drinking Caffeine Before Going to Bed

Multiple Choice

Imagine we found that drinking caffeine before going to bed significantly moderates the relationship between worry and sleep disturbances. What does this tell us?

A) That the relationship between worry and sleep problems changes as a function of caffeine consumption.
B) None of these.
C) That drinking caffeine before going to bed increases worry which in turn increases sleep disturbances.
D) That people who worry are more likely to drink caffeine before going to bed, leading to sleep disturbances.