Restless Legs and Blood Sugar
An uncomfortable urge to move your legs at night, and the three deficiencies worth checking before assuming it's neurological.
Restless legs syndrome is more common in people with diabetes than in the general population, and the reasons are worth knowing because several are treatable.
What it is
An uncomfortable sensation in the legs — variously described as crawling, aching, or an electric restlessness — accompanied by an urge to move that temporarily relieves it. Characteristically worse in the evening and at rest, and a common cause of difficulty getting to sleep.
The connections
Iron deficiency is the single most important treatable cause, and the relevant measure is ferritin rather than hemoglobin. Restless legs can occur at ferritin levels considered normal by standard ranges — many specialists use a considerably higher threshold when treating it. This is the check most often missed.
Peripheral neuropathy from elevated glucose can produce overlapping sensations, and the two are sometimes confused.
Kidney function, which is relevant given the overlap with diabetes.
Magnesium and vitamin D, both with some supporting evidence, neither definitive.
Medications, including some antidepressants and antihistamines, which can trigger or worsen it.
Why the sleep angle matters here
Restless legs disrupts sleep substantially, and disrupted sleep reduces next-day insulin sensitivity measurably. So this isn't only uncomfortable — it feeds directly into the metabolic picture.
Someone with restless legs, poor sleep and stubborn glucose numbers has a chain worth interrupting at the first link.
What to ask for
Ferritin, specifically, and ask what the number is rather than whether it's "normal." Given the threshold difference in this condition, the actual value matters.
Kidney function and glucose.
A medication review if it began after starting something new.
What helps
Treat any iron deficiency, under medical supervision — iron supplementation without deficiency is not benign.
Regular movement during the day, though not intense exercise close to bedtime.
Reduce alcohol and caffeine, particularly in the evening.
Consistent sleep timing.
Address glucose, which helps if neuropathy is contributing.
Effective medications exist for persistent cases and are worth discussing rather than enduring it.
Try this week: if this affects your sleep regularly, ask for a ferritin test and the actual number.
Education, not medical advice. Restless legs should be assessed by a doctor.