The finding that people who sleep after learning a list of nonsense syllables forget less than people who stay awake provides evidence that forgetting may involve question 10 options:

The finding is related to Interference theory. This theory is about human memory. Interference can take place in learning when there is an interaction of the new material and transfer effects of learned behavior in the past. In 1924, James Jenkins and Karl Dallenbach showed in their experiment that experiences gained everyday can interfere with memory. The experiment resulted in retention being better over a period of sleep than over the same amount of time spent on doing an activity.