The foreskin must not be turned outward to sleep. It is not recommended that men sleep with the foreskin turned outward, which may have adverse consequences. Generally speaking, if men turn the foreskin out and keep it in this state for a long time, it may cause the foreskin to be embedded, which will lead to poor blood circulation locally, and then lead to long time ischemia of the glans, which will lead to serious consequences, so it is not recommended that men turn the foreskin out and go to sleep. And a long time to turn over the foreskin, exposed glans, will increase the risk of glans infection, and then cause inflammation of the glans. If the male population has a long foreskin that causes the foreskin to be turned out, causing infection or incarceration, they should consult a regular hospital for treatment.