It is actually very possible to dream walk. This process involves the action of entering into other people's dreams and directly or indirectly interacting with them in their sleep. Check out http://www.ehow.com/how_5639675_dream-walk.html for more information.
Yes all you need is a dream walking potion from professor oak. To find him, climb Gods Thumb with an old Indian lady on your back. When on top, she will give you pro. Oaks numb. Goodluck with this crap