Restlessness is your nervous system stuck in a state of activation, and fixing it depends on what’s driving it. For some people, the cause is straightforward: too much caffeine, poor sleep, or pent-up physical energy. For others, restlessness signals something deeper, like iron deficiency, a medication side effect, or an underlying condition such as anxiety or ADHD. The good news is that most causes respond well to targeted changes, and many of them you can start tonight.
Figure Out What’s Causing It
Before you can fix restlessness, it helps to narrow down where it’s coming from. The most common everyday triggers are caffeine, sleep deprivation, stress, and lack of physical activity. But restlessness that persists despite addressing those basics often has a medical or chemical root.
If your restlessness centers in your legs, especially at night, you may be dealing with restless legs syndrome (RLS). The hallmarks are an uncomfortable urge to move your legs that starts or worsens when you’re resting, improves temporarily with movement, and is worse in the evening than during the day. RLS affects roughly 5 to 10 percent of adults and is strongly linked to low iron stores in the body.
If you recently started or changed a medication, restlessness could be akathisia, a side effect that creates an intense, almost unbearable need to move. Antipsychotic medications are the most common culprit, but certain antidepressants (particularly SSRIs like fluoxetine and paroxetine), anti-nausea drugs like metoclopramide, some blood pressure medications, and even the antibiotic azithromycin can trigger it. If you suspect a medication is involved, bring it up with your prescriber. The usual fix is lowering the dose or switching to a different drug.
Generalized anxiety and ADHD both produce restlessness, but they feel different. Anxiety-driven restlessness comes with worry, muscle tension, and a sense of dread. ADHD restlessness is more about being unable to sit still or feeling internally revved up without a clear emotional trigger. In adults with ADHD, hyperactivity often shows up as extreme restlessness rather than the obvious physical bouncing you’d see in a child. Getting the right diagnosis matters because the treatments diverge significantly.
Check Your Iron Levels
Low iron is one of the most underdiagnosed causes of physical restlessness, particularly in women, vegetarians, and people with digestive conditions. The key marker isn’t your standard hemoglobin test. It’s ferritin, a protein that reflects how much iron your body has stored. Experts in restless legs syndrome recommend a trial of iron supplementation for anyone with a serum ferritin level at or below 75 μg/L, a threshold that many doctors wouldn’t flag as “low” on a standard lab report.
If your levels fall in that range, oral iron supplements taken with 100 to 200 mg of vitamin C (to improve absorption) every one or two days on an empty stomach is the standard approach. It’s a slow fix: expect to give it a full three months before judging whether it’s working. If oral iron doesn’t help, isn’t tolerated, or absorption is impaired by conditions like inflammatory bowel disease or prior bariatric surgery, intravenous iron is the next step. A simple blood test can tell you whether this is worth pursuing.
Cut Caffeine Earlier Than You Think
Caffeine has a half-life of four to six hours, meaning half the caffeine from your 2 p.m. coffee is still circulating at 8 p.m. That residual stimulation can keep your nervous system activated well into the evening, producing the jittery, can’t-settle feeling that many people mistake for anxiety or insomnia. If you’re restless at night, try moving your last caffeinated drink to before noon for two weeks and see what changes. This single adjustment resolves more evening restlessness than most people expect.
Use Your Breath to Calm Your Nervous System
When restlessness hits acutely, a breathing technique called cyclic sighing can shift your body out of its activated state within minutes. A Stanford study found it was more effective at lowering resting breathing rate than traditional mindfulness meditation or other controlled breathing methods.
Here’s how to do it: breathe in through your nose until your lungs feel comfortably full, then take a second, shorter sip of air to expand your lungs as much as possible. Then exhale very slowly through your mouth until all the air is gone. Repeat for five minutes. The extended exhale is the key part. Exhaling activates the branch of your nervous system responsible for slowing your heart rate and producing a calming effect throughout your body. This works because your nervous system treats the exhale as a signal that you’re safe.
Move Your Body, but Time It Right
Physical activity is one of the most reliable ways to burn off the neurochemical fuel behind restlessness. Even a 20-minute walk can noticeably reduce that pent-up, agitated feeling. For people with restless legs syndrome specifically, moderate exercise during the day tends to reduce symptom severity at night.
Timing matters, though. Vigorous exercise within two to three hours of bedtime can raise your core temperature and adrenaline levels enough to make nighttime restlessness worse. If evenings are your problem window, shift intense workouts to the morning or early afternoon and keep any evening movement gentle: stretching, yoga, or a slow walk.
Cool Your Bedroom Down
Your body needs to drop its core temperature to fall asleep, and a warm room fights that process directly. Sleep onset and the decline in core temperature happen together. Your body temperature hits its steepest drop right around the time you’re falling asleep, and the lowest point comes about two hours later. If your room is too warm, your body can’t cool efficiently, and you end up tossing and turning.
The optimal room temperature for sleep sits between 19 and 21°C (roughly 66 to 70°F). Your body is trying to create a skin temperature between 31 and 35°C under the covers, and deviation from that range disrupts sleep quality. A warm shower 60 to 90 minutes before bed can actually help: it draws blood to the skin surface, which accelerates core cooling once you step out.
Try a Weighted Blanket
Weighted blankets work through deep pressure stimulation, which activates the same calming branch of your nervous system that the breathing technique targets. The sustained pressure on your body mimics the sensory input of massage or acupressure, dialing down your body’s alert response and promoting the relaxation side of your nervous system.
The clinical evidence is strong, particularly for people who also deal with anxiety, depression, or ADHD. In a study of 120 adults with insomnia and a co-occurring psychiatric condition, nearly 60% of weighted blanket users saw their insomnia severity drop by half or more within four weeks, compared to just 5.4% in the control group. After 12 months, 78% of the weighted blanket users were in full remission from their insomnia. A blanket that weighs roughly 10% of your body weight is the general starting point.
Build an Evening Wind-Down
Restlessness often peaks at night because your body hasn’t received clear signals that it’s time to transition out of daytime mode. A consistent pre-sleep routine, done in the same order each night, trains your nervous system to start downshifting on cue. This doesn’t need to be elaborate. Dim the lights an hour before bed, put screens away (the blue light suppresses melatonin, but the mental stimulation is arguably worse), and do something low-key: reading, stretching, or the cyclic sighing technique described above.
The consistency is more important than any single element. After a few weeks, your body starts anticipating sleep at that time and begins its core temperature drop and hormonal shifts earlier, which makes the restless tossing-and-turning phase shorter or eliminates it entirely.
When Restlessness Won’t Budge
If you’ve cleaned up your caffeine, sleep environment, and activity levels and you’re still dealing with persistent restlessness, the cause is likely medical. Iron deficiency, thyroid dysfunction, medication side effects, undiagnosed ADHD, and anxiety disorders all produce chronic restlessness that lifestyle changes alone won’t resolve. A blood panel checking ferritin, thyroid function, and basic metabolic markers is a reasonable first step. For medication-related restlessness, your provider may adjust your dose, switch you to a different drug, or in some cases add a short-term medication to counteract the side effect. The important thing is not to dismiss chronic restlessness as a personality trait. It almost always has an identifiable, treatable cause.