Experiencing your own dream as an outsider can be disconcerting, as Mohinder discovered when Sanjog Iyer manipulated his dream.
Oneirokinesis (also called Dream Manipulation or Dreamwalking) is the ability of a telepath to manipulate brainwaves during REM sleep, effectively controlling the victim's dreams. With this ability, the DNA Alternate can force the victim to dream about anything the Alternate chooses. The Alternate may or may not be able to project their minds into the dreams of the victim and walk in the victim's dream, and may or may not exert influence over their own dreams. The Alternate may or may not force lucid dreams, which would be difficult to escape. Of course, in the lucid dream, the victim may not desire to.