In a recent study it was found that a good night's sleep increases our positive memories.
Researchers split 70 young adults into two groups - one that got to sleep overnight and one that had to stay awake, Daily Mail reported Wednesday.
Both groups were required to look at positive images containing items such as puppies and flowers, and both at neutral images featuring furniture and dinner plates.
"Results showed sleep enhances our emotionally positive memories," said professor Rebecca Spencer of the University of Massachusetts.
Spencer believes the results could also have significant implications for treating post-traumatic stress disorder.