Why do I dream?
Every night, we all dream four or five times and each dream period lasts for 15 or 20 minutes.
No-one is entirely certain why we dream, but a prominent theory is that dreaming clears the brain of old, unwanted memories. Over a period of time, the brain acquires more information than it can hold - it has to clear unneeded and irrelevant memories to make way for more important ones. Some researchers describe dreams as “junk” information which the brain’s filing system is in the process of throwing out.
