One energy drink a month increases risk of disturbed sleep, study finds

People consuming cans daily sleep half an hour less than those drinking occasionally or never, researchers say

Energy drinks are associated with insomnia and poor-quality sleep, according to a large study that suggests just one can a month raises the risk of disturbed sleep.

Millions consume the products, which contain an average caffeine content of 150mg per litre as well as sugar, vitamins, minerals and amino acids. They are marketed as boosters of mental health and physical performance, and are popular with young people in particular.