WHY DO WE DREAM?

Freud said that whether we intend it or not, we're all poets. That's because on most nights, we dream. And dreams are lot like poetry, in that in both things, we express our internal life in similar ways. We use images more than words; we combine incongruent elements to evoke emotion in a more efficient way than wordier descriptions can; and we use unconscious and tangential associations rather than logic to tell a story.

While we are asleep, our brain can swift through different stages of sleep. In stage on you experience a drifting in and out of sleep. You can be easily woken up. Your eye movement and body movements slow down. You may experience sudden jerky movement of your legs or other muscles. In stage 2 eye movement stops and your brain waves become slower. There will also be brief bursts of rapid brain activity called sleep spindles. Stage 3 is the first stage of deep sleep. The brain waves are a combination of slow waves, known as delta waves, combined with faster waves. During stage 3 sleep it can be very difficult to wake someone up. If you are woken up during this stage, you may feel groggy and disoriented for several minutes. Stage 4 sleep is the second stage of deep sleep. In this stage the brain is making the slow delta waves almost exclusively. In this stage it is also very difficult to wake someone up. Both stages of deep sleep are important for feeling refreshed in the morning. If these stages are too short, sleep will not feel satisfying. REM sleep is the sleep stage in which dreaming occurs. When you enter into REM sleep, your breathing becomes fast, irregular and shallow. Your eyes will move rapidly and your muscles become immobile. Heart rate and blood pressure increase. Men may develop erections. About 20 percent of sleep is REM sleep for adults.

With this this video I understood that in order to have a healthy life I need to sleep.