Inclusion Criteria:  Patient whose age ≥ 18 years Patient with sleep apnea syndrome confirmed by polysomnographic or polygraphic recording The parameters of interest (Apnea Hypopnea Index, percentage of snoring and desaturation during the recording) are collected and in an identical way by its two examinations. They differ by the recording of other parameters. Patient for whom a sleep endoscopy is performed: clinical/recording discordance, failure or intolerance of the proposed treatment (OAM, PPC); surgical indication for OSA (tonsillectomy and/or velopasty) French speaking patient  Exclusion Criteria:  Patient under guardianship or curatorship Patient deprived of liberty Patient under court protection Patient objecting to the use of his data for this research