Voice Biomarkers to Predict Excessive Daytime Sleepiness

Inclusion Criteria: * Male ou female volunteers, who are between 18 and 50 years old, * With a BMI (Body Mass Index) between 18.5 and 25 kg/m2 for volunteers who are between 18 and 34 years old, or a BMI between 18.5 and 27 kg/m2 for volunteers who are between 35 and 50 years old , * Not having subjective EDS (Excessive Daytime Sleepiness) : total score at ESS (Epworth Sleepiness Scale) lower or equal to 11, * Not having insomnia complaints (ISI total score lower than 8), * Having a SCL90R (Symptom Check List- 90 items Revised) score lower than 60 (only for Anxiety and Depression categories' items of the checklist), * Regular bedtime between 22H00 and 0H00, regular get up time between 6H00 and 8H00, * Daily TST (Total Sleep Time) between 7 and 9 hours, * With no strong suspicion of OSAS (Obstructive Sleep Apnea Syndrome) as assessed by STOP-BANG questionnaire, * With no suspicion of RLS (Restless Legs Syndrome) as assessed by RLS screening questionnaire, * With sufficient reading abilities for the reading task as assessed by ECLA16+ ("Evaluation des Compétences de Lecture chez l'Adulte de plus de 16 ans" : higher ou equal performances than 25th percentile for performances assessed in total population for the following tasks : " lecture de " l'Alouette " " (Number of correctly read words / minute ≥ 121, number of errors ≤ 10), isolated words reading (regular words : score ≥ 18, time ≤ 17 sec ; irregular words : score ≥ 16, time ≤ 16 sec, pseudo-words : score ≥ 17, time ≤ 26 sec), repetition of non-words (score ≥ 19), and symbol crossing task (number of crossed symbols ≥ 22), * With a SE (Sleep Efficiency) higher or equal to 85% as assessed by the 7 nights-actigraphy made before inclusion, * With an AHI (Apnea/Hypopnea Index) lower or equal to 10 apnea or hypopnea/hour of sleep as assessed by the ventilatory polygraphy, * With a PLMI (Periodic Limb Movement Index) lower or equal to 15 sequences of PLM/hour of sleep as assessed by the ventilatory polygraphy, * Being an affiliated member of the Social Security system, * Being able to understand the study, * Being available to come at the four visits necessary for the study, * Having given written informed consent to participate to the study. Exclusion Criteria: * Having a life-threatening disease, * Any evolutive cardiovascular pathology - under treatment or not, * Any evolutive neurologic pathology - under treatment or not (brain tumour, epilepsy, headache, stroke, sclerosis, myoclonia, chorea, neuropathy, muscular dystrophies, myotonic dystrophy), * Psychiatric disorders - under treatment or not (characterised depressive episode, bipolar disorders, psychotic disorders, neurodevelopmental diseases), * Untreated endocrine disorders (diabetes, hyperthyroidism), * Dependency to a substance, * otorhinolaryngological disorder that could induce vocal parameters modification, * Fluence disorders (cluttering, stuttering), language disorders (dyslexia) or visual troubles that could impact reading abilities, * Participant under psychotropic treatment (antidepressants, antihistamine, etc…), or under treatment that could interfere with sleep or wakefulness level, * Participant under treatment that could impact the normal muscular function (myorelaxant, neuromuscular blocking agents injections in maxillofacial area, etc…), * Dental care during the follow-up of the study, * Shift-worker or night-worker, * Excessive consumption of alcohol (\>2 glasses per day) during the 6 last months, * Excessive consumption of coffee, tea, or any drink containing caffeine (like cola) (\> 5 cups/day), * Excessive tobacco smoking (\>5 cigarets/day), * Non-native French speaker, * Participant with a thick accent that could induce significantly vocal parameters modification (at the discretion of the investigator), * Deprived of liberty by a legal or administrative procedure, * Under tutorship or guardianship, * Pregnant or breastfeeding woman.