Ultra Long-Term Sleep Monitoring Using UNEEG™ Medical 24/7 EEG™ SubQ

Inclusion Criteria: * Age ≥18 years * Subjects must be of general good health Exclusion Criteria: * Has cochlear implants. * Involved in therapies with medical devices that deliver electrical energy into the area around the implant * Is at high risk of surgical complications, such as active systemic infection and hemorrhagic disease. * Are unable (i.e. mentally or physically impaired patient), or do not have the necessary assistance, to properly operate the device system. * Has an infection at the site of device implantation. * Operates MRI scanners. * Has a profession/hobby that includes activity imposing extreme pressure variations (e.g. diving or parachute jumping). N.B.: diving/snorkeling is allowed to 5 meters depth. * Has a profession/hobby that includes activity imposing an unacceptable risk for trauma against the device or the site of implantation (e.g. martial art or boxing). * Previous stroke or cerebral hemorrhage and any other structural cerebral disease. * Ongoing or history of sleep disorders. * Known neurological diseases. * Known or suspected abuse of alcohol defined as estimated consumption beyond that, which is recommended by the Danish Health Authority or any other neuro-active substances. * Other known diseases or conditions, judged by investigator to influence sleep to such a degree that data quality will be compromised. * Medication judged by investigator to influence sleep to such a degree that data quality will be compromised. * Incapable, judged by the investigator, of understanding the participant instruction or who are not capable of carrying through the investigation. * Pregnancy or intention to become pregnant within the next 12 months.