Oneironautics [ah-nayr-o-not-iks] refers to the ability to travel within a dream, usually on a conscious basis. A traveler in a dream may be called an oneironaut.
The idea of one person being able to consciously travel or interact within the dream of another person, known variously as "dream telepathy", "telepathic lucid dreaming" or "telepathic dreaming", has been explored in the realms of science and fantasy fiction; in recent works, such an interaction is often depicted as a computer-mediated psychotherapeutic action, as is the case in The Cell, and Paprika, as well as through the direct intervention of another sleeping person, as in Inception, Dreamscape and Waking Life. The concept is also included in the fantasy series The Wheel of Time as an ability "dreamwalkers" are able to use.
A trope in such works of fiction explore the ramifications of whether the sleeping protagonist should enter the sleeping brain of another as opposed to allowing another individual to enter one's own brain; the entering of another individual's brain often results in unpleasant surprises, depending upon the mental state of the host or the preparedness of the guest. Roger Zelazny's 1966 sci-fi novella The Dream Master, which applies computer-mediated dream telepathy in a psychotherapeutic setting, focuses on the protagonist's growing struggle to keep his balance as he enters the brain of a fellow psychotherapist who is blind and subconsciously, destructively hungers for the visual stimuli upon which dreams largely depend.
Oh man, I'm tired and lonely
Again, why must it be
A man is drowning slowly
And he can't keep above
Gone way to deep, oh yeah
Open skies are falling
Tears are coming down
Like a drop of rain falls to the ocean
And comes back around
One rainy day
Oh so many times I should've crawled when I went running by
And since then I've been left feeling traumatized
Raped and drained of an innocence
A gift we've lost over time
And still I gaze through this one rainy day
Alone with no one by my side
Open skies are falling
Tears are coming down
Like a drop of rain falls to the ocean
And comes back around, yeah
I swear I've given, I've given you all I can
Never will you ever make me feel this way again, oh
On this one rainy day
Hey, open skies are falling
Tears are coming down
Like a drop of rain falls to the ocean
And comes back around
One rainy day
One rainy day
Oh one rainy day