What is the ruling on stimulating one's own desires when sleeping on the stomach?

If lust is the result of thought, it must be repelled and not indulged in, as it may lead to forbidden acts, and the means to the forbidden is forbidden. As for fleeting thoughts, there is no sin in them as long as they are not invited or continuously dwelled upon. Sleeping on the stomach: If it is for pleasure and satisfying lust, it is forbidden. If it is a habit, it is disliked and harmful to health, and should be abandoned unless there is a need.