Inclusion Criteria:  Healthy volunteer Over 18 years old and less than 65. Having given his express consent Affiliated to a social security scheme or beneficiary of such a scheme  Exclusion Criteria:  Medical history of psychiatric disorders Psychotropic treatment narcolepsy Obstructive sleep apnea syndrome Symptoms that may correspond to COVID 19 Nickel allergy Refusal to participate in the study Protected subjects : Adults under guardianship, curatorship or other legal protection deprived of their liberty by judicial or administrative decision Pregnant, breastfeeding or parturient woman Subject hospitalized without consent