How to sleep© EXPRESS.CO.UK

More research is needed to understand the role of antioxidants in promoting sleep, but studies have shown that decreased antioxidant levels are linked to poor sleep.

Doctor Michael Breus, Clinical psychologist and Sleep Medicine Expert added: "Kiwi isn't the only potentially sleep-promoting food out there.

"There are a number of other types of food that can aid sleep. Magnesium and potassium-rich foods help promote relaxation and circulation.

"They include dark leafy greens, bananas, nuts, seeds, citrus, tomatoes and whole grains. Foods high in calcium help boost melatonin levels." 

 Sleep quality
Sleep quality© Getty

Another sleep-promoting fruit often mentioned by healthy bodies is the Montmorency cherry.

In one pilot study led by Louisiana State University, tart cherry juice extended the sleep time of senior insomniacs by 84 minutes.

Montmorency tart cherries, which are some of the common varieties of tart cherries, come in dried, canned, juice and concentrated forms.

Not only does the fruit contain antioxidants, but agricultural studies suggest it is one of the only dietary sources of the sleep hormone melatonin.