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Should I Drink Green Tea Before Bed? And What About Vitamin D for Sleep?

Updated on April 22, 2017

Should I drink green tea before bed? And what about vitamin D for sleep?

There are plenty of natural sleep aids around that have been used for thousands of years. Some of them are the answer for some people but not for others, so it’s more trial and error if you’re after natural a cure for your insomnia.

Here we’re going to look at the information available around green tea and sleep and vitamin D and other supplements and sleep.

For more on getting better sleep so that you wake feeling refreshed look at

Green tea and sleep.

Green tea is something that’s also been around for millennia. Recently it’s hit the health headlines as the latest wonder drink, said to improve prevent problems ranging from dizziness to Parkinson’s to some cancers.

Green tea and sleep disordered breathing.

Made from the Camellia sinesis plant, the tea is produced from its leaves. Green tea contains phenols which, in animal studies, have been linked with protection from neurological degeneration. This degeneration can lead to diseases such as Parkinson’s and Alzheimer’s.

The American Journal of Respiratory and Critical Care reports that green tea could help people who have memory problems related to sleep disordered breathing, such as sleep apnea.

The sleep apnea starves the brain of oxygen for short periods 100s times a night and this can lead to raised oxidative stress in the brain. Oxidative stress is believed to play a part in a lot of diseases and an antioxidant is thought to counteract this affect. Green tea’s phenols are just such an antioxidant so if you like the flavour, suffer from sleep apnea and have memory problems, there is some evidence that it may be helpful for you.

Try replacing your usual tea with green tea for a few weeks to a month and see if that makes a difference to your memory – ask those you live/work with if they’ve noticed an improvement. And even if you don’t notice a change you may be reducing your cholesterol and triglycerides by drinking green tea as this is another of the benefits attributed to it.

Green tea and insomnia.

There is less evidence however, that green tea is helpful for getting you to sleep or helping you stay asleep.

It contains 2-4% caffeine which is a stimulant and likely to add to your wakefulness if you’re sensitive to it. The amount of caffeine (and antioxidant effect) will depend on the strength of the infusion of the tea - ie how long you leave the tea bag in the cup/pot of boiling water before drinking.

Other teas such as camomile, peppermint (also good if you have an upset stomach that prevents you from sleeping), lemon balm or passion flower would probably be a better choice.

What about vitamin D and sleep?

In researching this hub I found 2 studies that looked at vitamins and sleep.

  1. One case study presented by the ‘Sleep Doctor’, Dr Michael Breus suggests that taking a vitamin D supplement can help with daytime sleepiness. After 4 months of daytime sleepiness one patient’s symptoms slowly began to improve when she was treated with intravenous vitamin D. She wasn’t suffering from insomnia or any sleep disorder that caused her sleepiness, but did have a low vitamin D level in her blood.

The Sleep Doctor also talk about magnesium 25mg/day with 500mg calcium to help sleep; folic acid; vitamin B6 (helps in the production of the relaxing hormone serotonin) and vitamin B3 which has shown to increase REM sleep and reduce nighttime wakenings.

  1. However the second study from the department of psychology at the University of Alabama in the US looked at over 700 people’s use of general vitamin supplements and their sleep patterns. Their conclusions were that people who took these supplements slept less well than those who didn’t. Supplement users woke more in the night, took more sleep meds and had more insomnia.

The researchers put forward 5 possible explanations for this:

  • Vitamin use disturbs a person’s sleep in some way, in some individuals.
  • There may not be a single vitamin that causes disturbed sleep but a combination may cause it.
  • People who have disturbed sleep/insomnia are more likely to use vitamins (this idea turns round the concept of vitamins causing sleep problems).
  • There is no link between vitamins and sleeplessness but other factors such as anxiety or depression causes sleeplessness and people with these conditions are more likely to take vitamins to help their health.
  • Their study results were unreliable and unpredictable – something that can be said of any study.

So does vitamin D help sleep?

You can probably see from the information above that scientists don’t know the answer to this. Therefore there is no clear evidence to lead doctors to recommend vitamins or vitamin D to help you sleep. But that doesn’t mean that you (as a non-scientist) shouldn’t try it for yourself.

A lack of vitamin D is a growing global problem, especially north of the equator, in people who are overweight, those with dark skins, those who are elderly and in pregnant and nursing mothers. Vitamin d deficiency has been linked to muscle pain, type 2 diabetes, thinning bones and other health problems.

The body makes its own vitamin D but does need enough sunshine on the skin to do this effectively. In countries where there’s not much sun for large parts of the year or where there’s a lot of sun but we’re constantly covered in sun block, vitamin D deficiency could be a problem so supplements probably won’t do any harm.

The bottom line is to talk to your doctor about vitamin supplementation and keep a sleep diary. Start it before you start taking vitamin D and during your treatment to see what benefits you might be getting as they may be gradual in their onset.


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    • Jackie Lynnley profile image

      Jackie Lynnley 3 years ago from The Beautiful South

      I drink green tea for the antioxidants and have been flu free for years but I didn't know about the other benefits, thanks for sharing!

    • Temirah profile image

      Temirah 4 years ago

      Thanks for your comment and your votes Peter. It's too easy to pop pills and like you say, they don't give the best results. FInding a natural way (or combination of ways) is better.

    • Peter Geekie profile image

      Peter Geekie 4 years ago from Sittingbourne

      Dear temirah,

      An excellent article on the benefits of using natural products to promote sleep rather than drugged sleep which is rarely restful. Voted up, useful and interesting.

      Kind regards Peter