Dr. Mantavya Punj practices Sleep Medicine in JACKSONVILLE, FL. Dr. Punj studies, diagnoses, and treats sleep disturbances and disorders due to varying factors. Sleep Medicine Physicians are trained to treat many different conditions, including insomnia, narcolepsy, sleep apnea, idiopathic hypersomnia, menstrual-related hypersomnia, and circadian rhythm disturbances, among others.