Inclusion Criteria:  Clear tonsillar hypertrophy (Brodsky grade III to IV), justifying surgery Pediatric Sleep Questionnaire ≥ 0.33 Discontinuation of any prescribed medication for Obstructive Sleep Apnea Syndrome (anti-histamine and montelukast) Access to the Didgeridoo course Consent of the holders of parental authority and agreement of the child  Exclusion Criteria:  Syndromic pathology Lack of affiliation to a social security scheme Holders of parental authority under guardianship or curatorship