CASE PRESENTATION: 21-year-old male, presented with history of diffuse myalgia, fatigue, elevated creatinine kinase. He was diagnosed with mitochondrial myopathy following a muscle biopsy. His family history was significant for his mother with a history of cognitive decline and myalgia, prompting a genetic work up, leading to a diagnosis of Weaver syndrome, complex I deficiency, and DNMT1 deficiency. He experienced EDS, sleep paralysis and hypnogogic hallucinations without cataplexy over a 6-month period. Overnight polysomnogram done for evaluation of EDS showed a Sleep efficiency of 72%, Sleep latency of 19.5 minutes, REM latency 131 minutes, apnea hypopnea index (AHI) 3.0. The multiple sleep latency testing (MSLT) showed a mean sleep latency of 7 minutes with Sleep Onset Rapid eye movement (SOREM) seen in 4 of 5 naps. A diagnosis of narcolepsy without cataplexy was established. Sleep logs were suggestive of delayed sleep phase syndrome. He was started on Modafinil with improvement in symptoms.