Scientists say, Cherry juice could hold the key to a good night's sleep. <br/><br/>A study found volunteers who drank a glass of unsweetened cherry juice in the morning and evening enjoyed more shut-eye than when they drank the same amount of other juices. <br/><br/>Research found cherry juice helped people sleep longer. <br/><br/>Psychiatrist Dr Wilfred Pigeon, of the University of Rochester in New York, who led the study, said the cherry juice effect could be due to the fruit's high content of melatonin, the hormone that regulates the body's sleep-wake cycle. <br/><br/>His researchers analysed sleeping patterns of participants on two routines. <br/><br/>During the first they drank cherry juice and the second a comparable fruit juice. The cherry juice led to an average of 17 minutes more sleep.