Philip K Dick 
Time Out Of Joint 

Ragle Gumm is an ordinary man leading an ordinary life, except that he makes his living by entering a newspaper contest every day – and winning, every day. But he gradually begins to suspect that his life – indeed his whole world – is an illusion, constructed around him for the express purpose of keeping him docile and happy. But if that is the case, what is his real world like, and what is he actually doing every day when he thinks he is guessing 'Where Will The Little Green Man Be Next?’