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Can oily fish, cherries or warm milk help you sleep?

by The Conversation
1st Jun 2022
in My Health
Reading Time: 6 mins read
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Bedtime sweet spot linked to heart health

Insomnia is a sleep disorder in which you have trouble falling and/or staying asleep. Photo: Supplied/Health For Mzansi

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Almost one in five British people report they don’t get enough sleep each night. The problem is so bad, that in total, the UK public is losing around a night’s worth of shut-eye each week.

There are a lot of popular beliefs about foods and drinks that help people get a good night’s rest, but many of them are not based on scientific evidence. Here’s what we know.

Sleep deprivation is detrimental to your health.
Sleep deprivation has grown increasingly widespread in developed countries during the last several decades. Photo: Supplied/Health For Mzansi

Chemistry of food and sleep

Our diet has an influence on sleep patterns by affecting the sleep hormone melatonin. For example, foods rich in the essential amino acid tryptophan are commonly cited as helping sleep, as tryptophan helps produce melatonin. Additionally, some vitamins and minerals may help sleep, such as vitamin D, magnesium, and zinc.

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Oily fish: Evidence suggests that more oily fish, such as salmon or herring, promotes better sleep. Oily fish contain healthy fats such as omega-3 oils which have been shown to improve sleep in children and are involved in the release of serotonin. Serotonin, a brain chemical linked to mood, also regulates the sleep-wake cycle which may also explain how eating oily fish can help.

Tart cherries: Several studies have looked at the consumption of tart cherries, usually in the form of a drink. Evidence suggests that tart cherries improve sleep in older adults, probably due to their ability to increase melatonin levels. And tart cherries are also rich in nutrients, including magnesium, which also may improve your sleep.

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Kiwi fruit: The evidence for kiwi fruit helping you sleep is mixed. One study suggested four weeks of kiwi fruit consumption improved multiple sleep measures, while another, admittedly in sufferers of insomnia, found no effect. Based on these findings, it is not clear yet that eating kiwi fruit will help one sleep better.

It is recommend that adults get at least 200g of fish per week, especially low-mercury “fatty” fish like sardines. Photo: Supplied/Health For Mzansi

Oysters: In 1888, W F Nelsom wrote: “He who sups on oysters is wont on that night to sleep placidly…”. There is some evidence to back up this statement, with zinc-rich foods, including oysters, being reported to induce shut eye. However, eating oysters before bedtime, is unlikely to be beneficial.

Alcohol and other drinks

Alcohol causes brain activity to slow down and has sedative effects that can induce feelings of relaxation and sleepiness. But consuming alcohol is linked to poor quality and duration. Although drinking alcohol may cause a more rapid sleep onset, this can affect the different stages of sleep, decreasing overall sleep quality.

If you want a good night’s rest, avoiding alcohol is sound advice. But are there any non-alcoholic drinks that might help?

Warm milk: Research conducted in the 1970s suggested that a glass of warm milk before bed could improve sleep quality. This research was performed on a very small group, however, and little research has been done since. Drinking milk does increase melatonin levels which could help. But there isn’t enough evidence to support the claim that a glass of warm milk definitely makes you nod off.

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Bone broth: Bone broth commonly crops up in online articles as a food that can aid bedtime slumber. This may be due to its high content of the amino acid glycine. Glycine has been shown to improve sleep in rodents and humans, possibly by lowering body temperature. There are however no studies specifically looking at bone broth consumption and sleep.

Irregular sleep patterns can affect your mental health, warn US researchers. Photo: Supplied/Health For Mzansi
Irregular sleep patterns can affect your mental health, warn US researchers. Photo: Supplied/Health For Mzansi

Herbal teas: The range of herbal teas aimed at the bedtime rest market has grown and grown. Evidence for valerian, a common ingredient to aid rest is inconclusive. Decaffeinated green tea has been reported to improve sleep quality, which might be linked to the relaxing qualities of L-theanine, an amino acid it contains, but in general, avoiding caffeinated teas is a wise choice. If you like herbal teas, include them in your relaxing pre-bedtime routine – but they are unlikely to improve your sleep quality.

A bedtime routine

Having a bedroom environment and daily routines that promote consistent, uninterrupted rest is important. These include keeping to the same time of heading off to bed, making your bedroom free of disruptions, and having a relaxing routine. But many of the foods that are apparently essential for a good night’s rest have very little evidence to back them up, to the point, that there are no legally recognised health claims for food assisting sleep approved in the UK or Europe.

If any one of these beverages or habits help you, there’s no reason to stop. But just remember the other basics of a good night’s rest too, including relaxing before bed and avoiding too much blue light from electronic devices.

This article was first published by The Conversation.

ALSO READ: Sound sleep is the best medicine

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