Are iron and vitamin D deficiencies to blame for women's sleep problems? Here's what you can do

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Two nutritional deficiencies disrupt women's sleep: iron and vitamin D deficiencies are surprisingly common

Hi, I'm Jon. As a self-help blogger, I explore how our daily habits affect our mental well-being. Today, I'll be focusing on sleep issues, a common problem faced by many women. As the title suggests, "These 2 Sleep-Disrupting Nutrient Deficiencies Are Shockingly Common in Women," and I'll explore why deficiencies in iron (an essential mineral) and vitamin D disrupt sleep. My articles are always based on reliable sources and explained in a way that's easy to understand for beginners.

Imagine going to bed every night, but struggling to fall asleep and waking up tired in the morning. Have you ever experienced this? Women, in particular, are prone to nutritional deficiencies due to lifestyle factors such as menstruation, pregnancy, and diet, which can lead to poor sleep quality. A 2024 study revealed that iron and vitamin D deficiencies are strongly associated with insomnia and sleep disorders. For example, iron deficiency can cause anemia (a condition in which there are not enough red blood cells in the blood, resulting in insufficient oxygen transport), which increases overall fatigue and disrupts sleep. Meanwhile, vitamin D is involved in hormone regulation, and a deficiency can disrupt the secretion of melatonin (the sleep hormone).

This problem is particularly prevalent among women, as iron is easily lost through menstrual bleeding, while vitamin D is lost due to lack of sun exposure and indoor living. According to data from the American Academy of Nutrition, approximately 40% of women are iron deficient, and nearly 70% are vitamin D deficient. If this is left untreated, it can lead to a vicious cycle of decreased productivity and worsening mental health. So, what can be done to address this? Let's start by taking a closer look at the latest research.

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The impact of iron deficiency on sleep: New research

Iron is the main component of hemoglobin (the oxygen-carrying protein in the blood) and is responsible for supplying oxygen throughout the body. In women, iron is easily lost during menstruation, making deficiency prone to becoming chronic. A study by Showa University School of Medicine published in November 2023 pointed out that vitamin D deficiency may cause chronic pain, which in turn may worsen sleep disorders, and a similar mechanism may also be at work with iron.

Specifically, a mindbodygreen article (published in 2024) showed that iron deficiency can induce restless leg syndrome (a condition in which discomfort in the legs interferes with sleep) and reduce sleep quality. Digging deeper from this article, a news article published by Michiwa Clinic on May 24, 2025, stated that a nocturnal lifestyle and vitamin D deficiency are associated with depression, and that iron deficiency also contributes to this. Iron deficiency inhibits the production of dopamine (a neurotransmitter in the brain), increasing anxiety and irritability and making it difficult to fall asleep.

Statistically, iron deficiency among Japanese women is serious, and according to a 2023 survey by the Ministry of Health, Labor and Welfare, approximately 30% of women in their 20s to 40s are at risk of iron deficiency anemia. This directly affects sleep because the brain remains awake due to a lack of oxygen. For example, this can make you more likely to wake up in the middle of the night and prevent you from achieving deep sleep (REM and non-REM sleep stages).

The adverse effects of vitamin D deficiency on sleep: from the perspective of sunlight and nutrition

Vitamin D is synthesized in the skin during sun exposure and is involved in bone health, immunity, and hormone regulation. Women tend to be deficient in vitamin D due to sun protection and indoor work. According to a December 13, 2023 article in ResMed, vitamin D supplementation may improve sleep and increase daytime energy.

A 2024 study linked low iron and vitamin D levels to sleep disorders in women, and recommended supplements and dietary improvements as countermeasures. Furthermore, information from Health and Longevity Net, updated on May 15, 2025, suggests that the recommended daily intake of vitamin D for people aged 18 to 70 is 8.5 μg (micrograms), noting that a deficiency can lead to depression and fatigue. Vitamin D deficiency in Japanese women is more pronounced in winter and when living indoors, and the November 2022 edition of the MSD Manual also cites a lack of sunlight as the primary cause.

Interestingly, a nocturnal lifestyle worsens vitamin D deficiency, which creates a vicious cycle that disrupts the sleep cycle. A May 24, 2025 article from Michiwa Clinic explains how vitamin D deficiency increases the risk of depression and reduces sleep quality. For example, vitamin D helps produce serotonin (the happy hormone), and a deficiency can lead to mental instability and insomnia.

Why are these deficiencies more prevalent in women?

Why are iron and vitamin D deficiencies so prevalent in women? First of all, iron is lost every month through menstrual bleeding, and the amount needed increases during pregnancy to supply iron to the fetus. Many people avoid red meat as part of their diet. On the other hand, the main cause of vitamin D deficiency is lack of sun exposure, but many women also use UV-blocking products due to their high level of beauty consciousness.

A November 12, 2022, article in Yahoo! News stated that nutritional deficiencies reduce sleep quality and recommended consuming foods containing vitamin D. A recent article (one week ago) from the Sakura Obstetrics and Gynecology Clinic also warned that vitamin D deficiency can lead to a weakened immune system and sleep disorders. Taken together, these findings show that women's lifestyles are contributing to these deficiencies.

Real-life strategies: Iron and vitamin D supplementation

Here's some practical advice: Consult your doctor first. (Safety note: This article is not medical advice, but informational. If you suspect you have a nutritional deficiency, always consult a medical professional and don't self-diagnose by taking supplements.) So, here's a list of some easy-to-implement strategies.

Eat iron-rich foods: Include liver, lean meat, spinach, and beans in your diet. Combining it with vitamin C (e.g., lemon) increases absorption.
Get Vitamin D from sunlight: Take a morning walk and sunbathe for 15-20 minutes. In winter, eat plenty of fish (salmon and sardines) and egg yolks.
Use supplements: Take iron and vitamin D supplements under the supervision of your doctor. Avoid overdosing.
Review your sleep habits: Reduce screen time before bed and maintain a regular routine. Also, do some light exercise to prevent fatigue caused by iron deficiency.
Regular blood tests: check iron (ferritin) and vitamin D levels. Women should monitor their menstrual cycle.

Making these habits will improve the quality of your sleep and increase your daily productivity. For example, simply combining iron-rich cereal with sun exposure for breakfast can be effective. A November 30, 2022 article on marine-bio.co.jp states that vitamin D helps to recover from fatigue.

Latest research-based findings and precautions

Recent research has pointed to a synergistic effect of simultaneous iron and vitamin D deficiencies that worsens sleep disorders. A 2022 Dutch review (President Online, 1 month ago) noted that vegan diets are prone to deficiencies in these nutrients, and warned female vegetarians to be cautious. A January 24, 2018, article by Wacoal explains how iron deficiency and lack of sleep can lead to metabolic decline.

However, a safety note: nutritional supplementation is individual, so always consult your doctor's advice. Excessive intake can lead to side effects (e.g., constipation from excessive iron, hypercalcemia from excessive vitamin D). Take a balanced approach based on reliable sources.

Summary: Take action now to get better quality sleep

Deficiencies in iron and vitamin D are hidden enemies that disrupt women's sleep. Recent research shows that supplementing these nutrients is likely to improve insomnia. Review your daily diet and lifestyle habits to build a healthy cycle.

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Finally, I hope you're sleeping better! Jon's blog will continue to cover these topics. If you have any questions, please leave a comment!

Two nutritional deficiencies that disrupt women's sleep: They're surprisingly common, and here's how to fix them