A Novel Approach to Manage Symptoms of Narcolepsy and Idiopathic Hypersomnia

Inclusion Criteria: * Evidence (from multiple sleep latency test, 24-hour polysomnography, or actigraphy) of diagnosis of narcolepsy type 1, narcolepsy type 2 or idiopathic hypersomnia that meets ICSD-3 criteria. * For the NT1 subtype, patients must have been screened positive for the HLA DQB10602 genotype. * Body mass index \>18.5 kg/m2 * 18 years or over * Be willing to be involved in dietary change that may include animal protein and fat. * Be willing to monitor ketones via finger-prick and urinary dipstick. * Habitual diet is a standard diet consuming a moderate or high carbohydrate level (defined for the study as above 130g carbohydrate/day). * Willingness to provide informed consent and willingness to participate and comply with the study requirements. * Access to a computer, laptop, tablet, or smartphone and stable internet access. * Proficient comprehension of English language (able to independently read information sheet) and availability of a support person during consultations if English comprehension is challenged. Exclusion Criteria: * Body mass index \<18.5 kg/m2, history of an eating disorder with an EDE-Q score greater than 3. * Participants who have sustained significant weight loss in the last 3 months (\>5% change in total body weight). * Previous bariatric surgery or current prescription of weight loss medication. * Diagnosis of unstable psychiatric disorders (excluding anxiety or depression). * Cognitive impairment that limits ability to understand the…