Restless sleeper? Iron might solve it!

by | Jun 15, 2021 | baby sleep, School

I’ve touched on magnesium before, but what about Iron? If you have a restless sleeper at home, iron might just solve the sleep issue. Before I get into it, I need to state this little disclaimer. I’m not a doctor or a professional research scientist. Both roles could have been on the cards, but I chose another direction. I am a behavioural sleep specialist with a fascination for all things sleep-related. And I follow the latest research and studies in the field whenever I can. Typically, when I write my blogs, I like to rely on peer-reviewed studies that have been evaluated, replicated, and borne out conclusive evidence to support them, but today I’m focusing on something that’s still on the speculative side, since it’s a relatively new theory. It’s a super interesting one for anyone with a seemingly “restless” baby though.

Why is baby restless?

When a parent tells me they have a restless baby, I have a series of questions I tend to ask in order to determine whether it’s due to a “sleep prop.” That’s sleep-industry terminology for something that baby has grown dependent on in order to get to sleep. Breastfeeding to sleep, rocking to sleep, sucking on a pacifier and pram rides, are all examples of these “sleep props.” And most of the time I find that, yes, reliance on the sleep prop is the problem, and we address it.  And things get significantly better in just a few nights. But every once in a while, there are other issues at play. Something beyond the standard prop dependency. There are babies or children who seem like they’re just more, well, restless than usual. They’re much more animated when they sleep, and they tend to flail around and have a hard time getting into a deep sleep. Sometimes magnesium and more sleep resolves this. But what if that’s not enough? I first heard mention of an interesting theory during the 2019 World Sleep Conference and was really interested to hear more about it. I didn’t want to write about it until a little more string had been played out in the research department. And even though it is still too early to state anything unequivocally, I thought the time might be right to at least share what I’ve learned so far, so here goes…

Iron is an essential trace mineral

We’re all familiar with iron, right? Everybody knows about iron, the essential mineral that helps red blood cells carry oxygen around the body. That function right there makes iron one downright essential component of our circulatory system and therefore our overall health. Iron deficiency, commonly known as anaemia, also happens to be the single most common nutritional deficiency worldwide. The vast majority of those cases are in developing countries, but the numbers in North America and Europe are still alarmingly high. So, in short, a LOT of people aren’t getting enough iron.

Could it be Restless Leg Syndrome (RLS)?

Now, if you follow health news, you’ve also probably heard about something called Restless Leg Syndrome (RLS). If you’re not familiar, RLS, also known as Willis-Ekbom Disease, is exactly what it sounds like; a condition that makes your legs feel restless. People with RLS describe the sensation as an irresistible urge to move accompanied by uncomfortable sensations in their lower limbs. Standing up and moving their legs typically remedies the feeling almost instantly, but only temporarily. Symptoms occur more frequently when individuals are sleeping or lying down. RLS is also a bit of a mystery when it comes to its cause.
According to the US National Institute of Health, “In most cases, the cause of RLS is unknown. However, RLS has a genetic component and can be found in families where the onset of symptoms is before age 40. Specific gene variants have been associated with RLS. Evidence indicates that low levels of iron in the brain also may be responsible for RLS.” So now comes the big question… could those restless babies that I was talking about earlier possibly be suffering from some variety of Restless Leg Syndrome due to an iron deficiency? It’s potentially a bit of a stretch, I know, and that’s why I went on the long preamble at the start of this post about how this was more theory than fact, but there’s a lot more information to work with here. In a 2008 joint study from the Southern Illinois University and Carle Clinic Association, 1.9% and 2% of children and adolescents respectively were shown to have Restless Leg Syndrome. A 2020 study from the BC Children’s Hospital Research Institute entitled Iron deficiency and sleep – A scoping review, found that iron supplementation was tremendously effective in treating a number of sleep disorders, including RLS. Sample sizes were small, and the data collection process leaves a little to be desired, but it’s still a good indication that iron plays a big role in the quality of sleep.

There are no markers to test for RLS

Unfortunately, diagnosing RLS isn’t an exact science. There are no markers or proteins to test for. It’s done by a doctor’s evaluation of the patient’s description of their symptoms, and for that reason, the only people who have been diagnosed are individuals who are capable of explaining what they’re experiencing. And guess who that leaves out… You guessed it; babies, toddlers, and as theorized in a 2005 study, a significant number of children. A 2005 Mayo Clinic study established rates of restless legs syndrome in children, finding that, “almost 6 percent of children seen in Mayo’s sleep clinic have the disease. The study also notes that the most common risk factors for the disease in kids are family history of restless legs syndrome and iron deficiency.” So back we go to the 2019 World Sleep Conference where one of the speakers put forth the theory that either RLS, or a variant of it, might be responsible for some babies being overly restless. Makes sense to me. Restless Sleep Disorder, as researchers have described it, hasn’t been thoroughly researched yet, but evidence suggests that it could be an early variant of restless leg syndrome, which in some cases could be caused by insufficient iron levels. Or, as they more eloquently put it in their conclusion, “We have characterized clinically and polysomnographically children with RSD and attempted a new diagnostic category. We also have identified an association between RDS and iron deficiency. Future larger studies are needed to confirm these findings and evaluate the natural progression of restless sleepers.” (unquote).

It’s not proven yet

So once again, I’m not trying to offer medical advice here. I just thought this whole line of research and discovery was fascinating and wanted to share it with you. If your little one is one of those overly animated sleepers, it might be worth asking your paediatrician or GP to check their iron levels. Even if it’s not the cause of their sleepless nights, anaemia is definitely something you’ll want to remedy. NOTE: don’t try and supplement without medical approval as too much iron is also harmful! And remember, if your baby fits into the other category, the much more prominent category who have trouble falling asleep because of their dependency on a “prop,” or sleep association, I’m here to help you solve that problem. It may not be as simple as taking an iron supplement (most sleep issues are a little more complex than that), but I can say unreservedly that it’s worth the effort to get your baby sleeping through the night. If you’d like a free initial sleep evaluation to see what may be causing your child’s sleepless nights, book a free call and we’ll talk it through! In the meantime, don’t forget to sign up to my newsletter and follow along on Facebook and Insta to stay in the know about sleep. REFERENCES: Iron deficiency | Blood | American Society of Hematology (ashpublications.org) Iron deficiency and sleep – A scoping review – PubMed (nih.gov) Mayo Clinic Finds Restless Legs Syndrome In Children Linked To Family History, Iron Deficiency — ScienceDaily Restless sleep disorder in children: a pilot study on a tentative new diagnostic category – PubMed (nih.gov)