Consciously forming what the sleeper dreams of, according to The Independent.
Hypnagogy is the first stage of sleep and is similar to rapid eye movement (REM) sleep in terms of brain waves and experience, yet sleepers can still hear the sound during hypnosis.
During the experiment, the participants listened to audio recordings, which included two requests: "Remember to think of a tree" and "remember to watch your thoughts."
At a later stage, they listened to the same requests after operating these suggestions at an appropriate time.
Using a manual sleep tracker, which can detect multiple changes such as the wearer's heartbeat, electrical charges on the skin, finger movement, and more, the researchers were able to know when the sleeper entered the hypnagogic stage and then determine the appropriate time to play the previously mentioned audio recordings.
A sleep tracker, called Dormio, can "provide sound at the right times and record the sound of dream reports," according to study lead author Adam Har Horowitz.
According to the study, more than two-thirds of the people in the study reported that dreams were a reflection of vocal requests.
One participant described tracing the roots of a tree, while another recalled a tree from his childhood. However, given that many aspects of dream manipulation are not understood, it is unclear how it might benefit them to nudge a sleeper's dreams.
Targeted Dream Incubation (TDI) with the Dormio device is a very welcome new technology that enables specific words and themes to be implanted in dreams.
Dormio allows dream content to be changed while sleeping in the home providing opportunities for large-scale testing.