Vanish by Dawn

Frankie Milligan has a serious problem. He periodically wakes up at dawn lying in the same deserted field clutching an empty bottle of Grey Goose vodka. Frankie is convinced that during the night he was transported into an alternative universe, and changed into a famous sports figure or rock star.
Frankie thinks these inexplicable dreams are real. One night he truly believed he was Lou Gehrig giving his famous farewell speech in Yankee Stadium. The next night he became Jim Morrison stoned on opium living in Paris with his girlfriend.
Vanish by Dawn is an intense psychological drama filled with many unexpected, and bizarre twists and turns. As the narrative unfolds, Frankie struggles to keep his sanity, and function normally as he becomes increasingly unable to know the difference between the "Real World" and the "Flash World" of his horrifying nightmares.