CUT OUT CAFFEINE AND GO LIGHT ON THE BOOZE:

“Stay away from alcohol or caffeine six hours before bed,” says Dr Kim Glass, lead GP at Bupa Health Clinics (bupa.co.uk). “Caffeine is a stimulant and the effects can stay in the system for hours. Alcohol reduces the amount of REM (rapid eye movement) sleep you get – the type of sleep which makes you feel most rested.”