I work as a consultant neurologist within the Department of Neurology and Sleep Disorders Centre at Guy's and St Thomas' Hospitals, and at London Bridge Hospital, the Cromwell Hospital, and One Welbeck. I was clinical lead for the Sleep Disorders Centre, Guy's Hospital, one of Europe's largest sleep units, for over a decade.

I am also Professor of Neurology and Sleep Medicine at the Institute of Psychiatry, Psychology and Neuroscience, King's College London.

I currently undertake general neurology clinics and specialist clinics for sleep disorders and epilepsy. 

I completed medical school at Magdalen College, Oxford, and Imperial College at St Mary's. After general medical training, I went on to complete a PhD in the genetics of epilepsy and drug management at Imperial College London and the Wellcome Trust Sanger Institute, Cambridge.

I undertook neurological training at Guy's and St Thomas', Charing Cross Hospital and the National Hospital for Neurology and Neurosurgery, Queen Square. 

After a fellowship in epilepsy and sleep medicine at St Thomas' and Queen Square, I joined Guy's and St Thomas' as a consultant in 2010.

I lecture regularly and have ongoing research interests in narcolepsy, epilepsy, sleepwalking, Kleine-Levin syndrome and restless legs syndrome. I have been or am currently principal investigator or collaborator in several multi-centre studies involving seizures, Alzheimer's disease, Parkinson's disease,narcolepsy, non-REM parasomnias, REM sleep behaviour disorder and insomnia.

I also have an interest in public education. I am author of “The Nocturnal Brain - Nightmares, Neuroscience and the Secret World of Sleep”, now translated into eleven languages. I have presented three series on BBC Radio 4 and BBC World Service, on neuroscience - "Mysteries of Sleep", "The Senses", on the neurology of our sensory world, and “Phantoms in the Brain”, on the links between physical and mental illness. I have also filmed "The Secrets of Sleep" for Channel 4 Television. My most recent book “The Man Who Tasted Words”, published by Simon and Schuster is out now. I am recipient of the 2019 Ellison-Cliffe Medal from the Royal Society of Medicine.