It's late, you're tired but wide awake, and you've just heard a doctor on a podcast link vitamin D to sleep. It's a fair question, and lots of parents ask it. Here's what the research says so far, and what tends to help in the meantime.
The short answer
- Researchers are genuinely interested in vitamin D and sleep, but the evidence is still early and mixed.
- Because of that, there is no authorised EU health claim linking vitamin D to sleep, so we only describe what vitamin D is recognised for.
- Simple habits like morning daylight and a regular routine are a good place to start.
- If poor sleep keeps going, your GP is the right person to talk to.
What the research is looking at
In 2012, US neurologist Dr Stasha Gominak and Walter Stumpf published a hypothesis in Medical Hypotheses. They noted that there are vitamin D receptors in parts of the brainstem involved in sleep, and described a pattern Dr Gominak had seen in her clinic. She followed it up in 2016, and other groups have since run small trials.
A 2022 review in Nutrients (Abboud) brought those trials together. Sleep-quality scores on questionnaires sometimes improved a little, but results on actual hours slept were mixed, and the studies were small. That's a normal place for new research to be: interesting, worth following, and not settled yet. We'll keep reading as more studies come out.
What vitamin D is recognised for
In the EU, the authorised wording for vitamin D is:
- Vitamin D contributes to the maintenance of normal bones.
- Vitamin D is needed for normal growth and development of bone in children.
- Vitamin D contributes to normal muscle function.
- Vitamin D contributes to the normal function of the immune system.
If tiredness is what you're really dealing with, we've written about that separately: Tiredness: what food can and cannot explain.
How much vitamin D, and where it comes from
EFSA, the EU's food safety authority, uses 15 µg a day from age 1 as an adequate intake for people who get little sun (EFSA, 2016). Its long-term upper limit is 100 µg a day for adults and children from 11, and 50 µg for ages 1 to 10 (EFSA, 2023). If you use more than one product, add up the micrograms.
Our skin makes vitamin D from sunlight, and how much depends on where you live, the season, the time of day and how much time you spend outside. A winter in Dublin isn't a summer in Faro.
- In Portugal, SNS 24 advises 400 IU (10 µg) a day in the first year of life, and from age 1 points to food and ordinary time outdoors (SNS 24).
- In Spain, the Ministry of Health advises against screening everyone and says supplementation should follow clinical advice (Ministerio de Sanidad, 2025).
A quick tip if you have a blood test: labs report vitamin D in nmol/L or ng/ml. Multiply ng/ml by 2.5 to get nmol/L, so 20 ng/ml is 50 nmol/L. Your doctor can tell you what your result means for you.
More on this: How much vitamin D does a child need? and Vitamin D in summer.
Small things that often help with sleep
These aren't health claims, just sensible everyday habits:
- Get some daylight in the morning, even a short walk.
- Keep bedtime and waking time roughly the same, weekends included.
- Dim screens and lights in the hour before bed.
- Watch for caffeine later in the day.
- If sleep problems last more than a few weeks, or affect daily life, speak to your GP.
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Where My Daily Pocket fits
Each daily scoop contains vitamin D3 alongside other nutrients:
| Formula | Vitamin D3 per scoop |
|---|---|
| Pocket Kids (4–11) | 25 µg |
| Pocket Teens (12–17) | 35 µg |
| Pocket Adults (18+) | 35 µg |
It's a daily multinutrient, not a sleep product. If you already use vitamin D drops at home, count those micrograms too.
FAQ
Does vitamin D help you sleep?
Research is ongoing but early and mixed, so there is no authorised EU health claim for vitamin D and sleep.
What is vitamin D recognised for?
Vitamin D contributes to the maintenance of normal bones, is needed for normal growth and development of bone in children, contributes to normal muscle function, and contributes to the normal function of the immune system.
How much vitamin D does EFSA suggest?
15 µg a day from age 1, for people who get little sun.
What if I really can't sleep?
Your GP is the best place to start, especially if it's been going on for a while.
Sources
- EU Register of nutrition and health claims
- EFSA, dietary reference values for vitamin D, 2016
- EFSA, tolerable upper intake level for vitamin D, 2023
- SNS 24, Vitamina D
- Ministerio de Sanidad, vitamin D recommendations, 2025
- Gominak SC, Stumpf WE. Medical Hypotheses, 2012
- Abboud M. Vitamin D supplementation and sleep. Nutrients, 2022
About the authors
Lina is a co-founder of My Daily Pocket and is certified in nutrition. Stanislava is a co-founder. They write the Knowledge Hub together.
Last reviewed: 15 October 2026.
Food supplements should not replace a varied, balanced diet and a healthy lifestyle. Do not exceed the recommended daily dose. If you are pregnant, taking medicines, or have a medical condition, speak to a healthcare professional.
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