Intranasal Steroid as Medical Therapy For Sleep-Disordered Breathing in Children

Inclusion Criteria: Each participant must meet all of the following criteria to be enrolled in this trial: * Is between the ages of 3 and 12 years inclusive at the time of randomisation * Has symptoms of Sleep Disordered Breathing (SDB) as determined by a Brouillette score ≥ -1 on telehealth/phone screening * Has a legally acceptable representative capable of understanding the informed consent document and providing consent on the participant's behalf. Exclusion Criteria: Participants meeting any of the following criteria will be excluded from the study: * Has a BMI over the 97th centile for age and gender * Has a history of tonsillectomy and/or adenoidectomy * Has a prior diagnosis of craniofacial, neuromuscular, syndromic or defined genetic disorders * Has a history of haemorrhagic diathesis or recurrent (daily) or severe epistaxis * Has a history of nasal surgery or trauma which has not fully healed * Has active tonsillitis or nasal infection (must be resolved prior to randomisation) * Is assessed to have stertor (snoring) while awake at rest * Has a known hypersensitivity to the study drug or its formulation * Has used oral, intravenous, or intranasal steroids in the past 6 weeks. (Inhaled steroids for asthma will be allowed concomitantly during the study) * Daily use of antihistamine or decongestant nasal sprays * Is known to require systemic steroids prior to the completion of the study treatment phase * Has had treatment with any other investigational drug within …