Japanese scientists have isolated two sleep-related peptides in the human brain, one is a dreamless sleep-promoting peptide and the other is a dreamless sleep-promoting peptide, and conducted research on them. Researchers used dream-promoting sleep-inducing peptides to lengthen the dreamy sleep time of animals, and found that most of these animals have extended their lives. This proves from a certain angle that dreaming is beneficial to health, thus overturning the long-standing belief that dreaming more while sleeping can affect human health.

To be precise, during the process of dreaming, the dreamer will constantly adjust himself, turning various stimuli received during the day into perceptions and incorporating them into the specific plot of the dream. Once this stimulus is responded to, the dreamer can continue to sleep, which is the basis for ensuring healthy sleep. Freud revealed this particularity of dreams very early. His explanation was that dreams not only help us release our spirit, but also maintain our sleep. Freud made a very detailed analysis in 'Interpretation of Dreams', saying that if stimulation such as wanting to drink water when you are thirsty, wanting to wear clothes when you are cold, and looking for food when you are hungry cannot be realized in a dream, it will be easy to wake up. On the contrary, if you want to sleep soundly, you can only rely on the realization of your dreams to alleviate them, but it will also show anxiety. For this reason, Freud called dreams 'guardians of sleep.'