Basically, yes. As, while you are asleep, you cannot interrupt the application with supporting regenerative massages of the penis, wearing the devices over night is not recommended and should only be considered if no application times of several hours can be achieved during the day. If a penis expander must be applied while asleep nevertheless, the user should familiarize himself with the application in a sufficient manner and should have determined the pulling force and holding settings applicable to him while he is still awake. In this, wearing the device without any interruptions covering a period of several hours should be tested, as this corresponds to application over night. Please refer to the operating instructions of the respective product.