What did you dream about last night?
Freud believed that dreams were a way of acting out inhibited yearnings and unfulfilled wishes, their purpose being to help our conscious selves deal with the problematic content of our unconscious.
But this theory has been rejected by many since, although the reason we dream still remains a mystery.
The modern explanation is that dreams evolved as a form of simulator for us to rehearse survival strategies, which would explain why so many of our dreams have negative connotations and often consist of us being chased or followed.
Freudian Slips: All The Psychology You Need To Know, by Joel Levy (Michael O’Mara, £12.99)