At present, the conclusion is that most people dream at the same speed or even slower than reality, and a few people dream faster than reality. The reason is only a theory, and there is no recognized reason. That is, in most cases, the speed is 1: 1. The following are some experiments and discussions:

Experiments and limitations of ordinary dreamers

Experiments and limitations of lucid dreamers

Possible theory

My personal guess is.

The direction worthy of experiment in the future

1. Experiments on ordinary dreamers:

William demont, the father of sleep medicine, conducted two experiments at 1950n. One is to ask dreamers to write down words that describe their dreams. He found that the more words, the longer the dream. Another experiment is to wake people who are dreaming and ask them how long they have been dreaming. Compared with the actual time, 83% people make a judgment consistent with the actual time. He came to the conclusion that the speed of time passing in the dream accords with the reality.

The limitations of these two studies are very obvious: first, the correlation between words and time, which has a lot to do with people's descriptive ability and memory, and there are too many variables. The second is that 17% people have a gap between their sense of time and reality in their dreams, which probably means that "long dreams" do not happen often. Finally, this study may be too long, and I didn't find the original paper. The apparent degree of these correlations is questionable.

In a word, these two studies explain most cases, but they can't explain special cases.

There is no difference between dream time and reality. In 2004, researchers Eracher and Schrader experimented with five advanced lucid dreamers, asking them to do the following things in order in their dreams, and marking them with "left and right" eye movements at the beginning and end of each stage:

Stand up in a lucid dream

Count from 2 1 to 25

Do 10 squats

Count 2 1 to 25.

The results show that the time of counting in dreams is similar to that in reality, but the time of squatting in lucid dreams is 40% more than that in reality.

In 20 13n, Erlacher and Schredl also conducted experiments on the form, length and complexity of tasks in lucid dreams. Or find a senior lucid dream player to conduct three experiments in sequence:

Let five people count to 10/20/30 in waking and dreaming respectively, and mark them with eye movements;

Let eight people walk in steps 10/20/30 respectively;

Having eight people do gymnastics is equivalent to taking 10 steps.

As a result, most people spend more time counting, walking and doing actions in their dreams than in reality, and the gap in muscle movement is more obvious. The author speculates that this is due to the lack of muscle feedback in lucid dreams or the slow neural processing during REM sleep.

I found that there are always 1-2 people who dream less in each experiment, but the time is not obvious. This shows that it is also possible to experience a dream time longer than the real time in a lucid dream.