Okupacja (2011)

A young guy, genuinely interested in esoteric matters, incite his friends to come along with him to an empty house somewhere far from civilization. Once there, he explains his plan to carry on a para-psychological experiment where dreams play a main role. Despite initial mistrust, his friends accept to take part in the experiment. However, they didn't expect that for trying to reach another spheres of reality they will have to pay with their own souls. But that's not the end of it, as it turns out they will be forced to pay also with their own bodies, and not only them.