2 Answers

  1. I also thought about this question and the answer to it, as it turned out, is very logical and simple:

    During sleep, a person periodically alternates between two main phases: slow and fast sleep, and at the beginning of sleep, the duration of the slow phase prevails, and before waking up, the duration of REM sleep increases. At the same time, slow and fast sleep also have several stages, so, for example, answering the question, the third and fourth stages of slow sleep are often combined under the name delta sleep. At this time, it is very difficult to wake a person up; 80% of dreams occur, and it is at this stage that sleepwalking and nightmares are possible, but the person remembers almost nothing of this. The first four slow-wave stages of sleep normally occupy 75-80 % of the entire sleep period.
    And in the morning we wake up in the REM sleep stage, which is why we don't remember our heartwarming/exciting/erotic dreams, such things)

  2. Previously, I conducted a study: in the middle of the night, after a dream, I woke up and wrote down the details of the dream and went back to sleep. And when I woke up in the morning, I don't remember what I dreamed. Only when reading the notes, I started to remember.

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