Sujay Kansagra, Mattress Firm’s sleep health expert, tells Healthline. “While some may suggest that dreams are a window to the subconscious, other theories posit that dreams are a nonsense result of the activity that takes place while we sleep and restore our brains,” Dr. This is partly because the brain activity can’t tell us about the content of dreams, and you have to rely on subjective accounts from people. Dream research is a wide and complex field, and dreaming can be hard to study in a laboratory. That answer can vary depending on which theory of why humans dream you decide to follow, because there’s quite a few. So if everyone dreams, why don’t we all remember them? Alex Dimitriu, double board-certified in psychiatry and sleep medicine and founder of Menlo Park Psychiatry & Sleep Medicine, tells Healthline. It is an essential function for the human brain, and also present in most species,” Dr. “Whether they remember or not, all people do dream in their sleep. This stage usually begins about 90 minutes after you fall asleep, and can last for up to an hour toward the end of sleep. Mike Kisch, co-founder and CEO of Beddr, a sleep tech start-up, tells Healthline that dreaming tends to occur during this time because our brain wave activity becomes more akin to that of when we’re awake. This sleep stage is characterized by rapid eye movement (what REM stands for), increased bodily movement, and faster breathing. Dreaming tends to take place during REM sleep, which can occur multiple times a night. Let’s start with why and when dreaming occurs.
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