Dr Nerina Ramlakhan is a physiologist and sleep and stress-management expert. Her work has been featured in newspapers and magazines including The Times, the Guardian, New Scientist, Healthy Living and Psychologies, and she has appeared on numerous TV and radio programmes. Nerina is the sleep advisor to the Silentnight bed company and also runs sleep and wellness programmes at Nightingale Hospital, London. She is also a mother, climber, marathon runner, meditator and compulsive bookworm. Find out more at www.drnerina.com or on Twitter @DrNerina.