[horrorchic]

Well with anything that is drug induced and is about drugs, you can over do it on the delusions, illusions, and general madness. If the audience can never tell where reality begins and the dream-state ends then they most likely will decide that the movie as a whole is a wash. But in a very off chance you could become the next David Lynch, just from Sweden instead, I say go ahead and at least write a tentative script. Point is to try to make the difference discernible.

Though I don't want to deter you from the theme you have chosen, please keep in mind that Alice in Wonderland for the next couple of years maybe over done as a theme, since Burton and now those Kondelik Brothers have developed and started filming Alice movies; I can already tell that the theme is a bit used.