Astral Games by Peter Brown

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The protagonist is Karl, whose father died not so long ago, he lived an ordinary life, with his mother and younger sister. But one day he realizes that his life is not so ordinary: falling asleep in his room in the evening, he finds himself in the head of his neighbor Sveta, and seems to be able to influence the course of her thoughts ...
In the process of playing, Karl will learn about the secret of the sister, help her mother with the restaurant business and use her neighbor to make money.