Nutrient Deficiencies & Sleep Problems
Vitamins, Minerals, Sleep.
Sometimes your sleep behaviours and habits are on point and it’s something else disturbing your nights.
My sleep was a mess my whole life. There were a lot of factors that were inside my sphere of control that I was able to fix but one of them was outside my control and needed medical attention. Even though I had started CBT-I (Cognitive Behavioural Therapy for Insomnia - still considered the gold treatment for treating insomnia), I was having some other weird symptoms that ended up being connected to my sleep issues. Apart from terrible sleep and daytime fatigue, I had this tingling feeling in my arms and fingers and I felt like I had the flu, like I was really achy, sore and fatigued. I was generally so unwell (due to years of not sleeping and a burnout), I didn’t really think too much of it but my doctor suggested I get some blood taken and it turned out that I was extremely deficient in B12, which explained some of the symptoms I was having.
For a little while, I had to get weekly, then monthly B12 injections. Then I could take oral supplements on a daily basis. Over time, I wasn’t feeling as foggy brained and fatigued and the tingling went away.
What I didn’t know until I started studying sleep is that nutritional deficiencies can contribute to poor sleep and daytime fatigue and poor sleep itself can impact the way we absorb nutrients. With B12 specifically, this vitamin helps regulate the timing of your sleep (ie circadian rhythm), the timing of melatonin and how neurotransmitters communicate with each other but sleep disruption can impact how B12 is metabolized, absorbed, and utilized.
Other vitamin/mineral deficiencies associated with poor sleep include:
Vitamin D
Magnesium
Iron
B6
Calcium
Zinc
What is the connection between essential nutrients and sleep?
Vitamin and mineral deficiencies don’t disrupt sleep in just one way—they interfere with core biological systems that regulate sleep itself. The strongest explanations fall into a few key pathways:
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Sleep timing is controlled by the circadian system. Some nutrients regulate the genes that control the sleep–wake cycle (which influences timing of sleep) and others influence light sensitivity and internal clock signalling. So if you’re deficient in certain nutrients, the result may be irregular sleep timing, delayed sleep onset, or fragmented sleep.
A vitamin D deficiency has been most strongly correlated with issues in body clock disruptions.
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Melatonin is the hormone that signals “it’s time to sleep.” Some nutrients indirectly regulate melatonin synthesis but if you’re deficient in these, you may experience difficulty falling asleep, reduced time in deep sleep, or lowered or mistimed melatonin levels. Vitamin D, B6 and magnesium have been linked to these issues.
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Sleep depends on a balance between excitatory signals (these keep you awake) and inhibitory signals (these promote sleep) and certain vitamins and minerals help regulate this balance. If you’re lacking in these nutrients, it may result in that “tired but wired” feeling, light and easily disrupted sleep, or neurological restlessness (especially with iron deficiency). If you’re not getting enough magnesium and/or iron, you may experience these symptoms.
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Chronic low-grade inflammation is strongly linked to poor sleep. Some vitamins act as an anti-inflammatory regulator and some help modulate immune signaling (eg. intentionally altering—either enhancing or suppressing—the chemical messages, receptors, and pathways that immune cells use to respond to threats). Low vitamin D, magnesium or zinc may impact these factors. A deficiency may lead to reduced sleep efficiency, more awakenings, and non-restorative sleep.
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Sleep is tightly connected to hormones like cortisol (stress hormone), serotonin, and growth hormone and certain essential nutrients help regulate the stress response and influence cortisol timing. If vitamin or mineral levels are off, particularly magnesium or vitamin D, this may result in elevated nighttime cortisol, difficulty relaxing before bed, or early awakenings.
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Some deficiencies, such as iron, cause physical sensations that disrupt sleep and are linked to sleep disorders such as Restless Leg Syndrome (RLS). If you’re lacking in this essential nutrient, you may experience frequent awakenings or difficulty falling asleep because of an inability to stay still.
So….is an essential nutrient deficiency “THE thing” that’s keeping you awake?
Perhaps. But probably not.
I want to be clear - vitamin and mineral deficiencies don’t tend to cause insomnia directly but rather they destabilize the systems that make stable sleep possible. My sleep was a dumpster fire to begin with and there were a range of factors that were contributing to my problems. Addressing my B12 deficiency was a necessary additional step in my treatment plan but had I ONLY addressed the essential nutrient component, I’d still be an insomniac.
That said, one of the first questions I ask my clients is “Do you have a family doctor and when was the last time you had blood work done?” While a lot of our sleep issues are a mixture of unhelpful behavioural and lifestyle habits, in some cases, there may be a medical issue at play that is very treatable. So don’t hesitate to speak to your primary care provider to rule out any vitamin or mineral deficiencies that may be causing, or compounding your sleep issues.
