Sleep is a visual novel on a spicy topic. You will play as a young man who has a sleeping problem. He sleepwalks and remembers nothing. To make sense of his problem, he starts recording himself when he sleeps. What he finds out will turn you on over the limits. When he replays the tapes, he discovers that his sister has been taking advantage of his sleeping problem by coming into his room and using his dick as her personal dildo. Many things will diverge out of this situation. The graphics are good, and the incest interaction is well-written.