There are a number of films in which for an hour and a half something unobvious happens, and then in the last five minutes the authors try (successfully or not very) to explain to the viewer what really happened. The speed with which the viewer loses interest in what is happening, as well as the degree of joy of the viewer at the end of the viewing, are inversely proportional to the number of films viewed on similar topics. For me, unfortunately, Stay in this line was not the first. But visually very, very boring.
If you have not yet had time to read spoiler reviews, take a look at the list of similar films kindly selected by the Kinonavigator. If their names look unfamiliar, watch Stay for health.