There are 2 books in the The Journals of Zaxony Delatree series. The newest book is Prison of Sleep which came out in 2022.

1
Doors of Sleep

Book cover of Doors of Sleep
Every time Zax Delatree falls asleep, he travels to a new reality. He has no control over his destination and never knows what he will see when he opens his eyes. Sometimes he wakes up in technological utopias, and other times in the bombed-out ruins of collapsed civilizations. All he…
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2
Prison of Sleep

Book cover of Prison of Sleep
Every time Zaxony Delatree falls asleep, he wakes up on a new world. His life has turned into an endless series of brief encounters. But at least he and Minna, the one companion who has found a way of travelling with him, are no longer pursued by the psychotic and…