Circadian Rhythm, Dopamine, and RLS: Why Does It Worsen at Night?

The Biological Basis of Increased RLS Symptoms in the Evening and at Night

Everything in our body operates according to a 24-hour rhythm: body temperature, hormones, alertness, and sleepiness. As evening approaches:

• The body naturally shifts toward a state of relaxation, while prolonged periods of sitting or lying down increase.
• The “gas-and-brake balance” of the muscles and nervous system changes; in some people, this may be experienced as tingling in the legs and an urge to move.
• Pain and sensory thresholds may change toward nighttime, making minor discomforts more noticeable.

The Dopamine Cycle and the Sleep–Wake Rhythm

Dopamine is one of the brain's chemicals involved in “movement and motivation.” Its levels fluctuate throughout the day. Some research suggests that changes in dopamine signaling at night may make RLS symptoms more noticeable. If a person's iron stores are low (especially ferritin), the proper functioning of dopamine may become more difficult. As a result, the urge to move the legs may increase at night, and sleep may become disrupted.

Blue Light, Late-Night Eating and Drinking, and Jet Lag Effects

• Blue light (phone, tablet, TV): It sends the brain a “daytime” signal. It may delay the release of the sleep hormone melatonin; falling asleep may become more difficult, and restlessness may become more noticeable.
• Late-night meals/heavy snacking: The digestive system becomes more active and body temperature may increase. This may trigger leg discomfort in some people.
• Caffeine/nicotine/alcohol: When consumed in the evening, these substances may stimulate the nervous system and increase nighttime symptoms.
• Jet lag/night shifts: Because they disrupt the internal body clock, sleep may become fragmented and RLS symptoms may be noticed more frequently.

Evening Routine Recommendations (Light Hygiene, Warm Shower, Stretching)

• Light hygiene: Screens can be avoided 1–2 hours before bedtime, and room lighting can be kept warm and dim.
• Light movement: Gentle stretching exercises, a short walk around the room, or leg massage can be performed.
• Warm shower/foot bath: May help relax the muscles and prepare the body for sleep.
• Limit caffeine/nicotine/alcohol: Especially during the evening hours.
• Regular sleep: Whenever possible, it is recommended to go to sleep and wake up at similar times each day.

Mini Checklist

• Did I turn off screens early tonight (at least 1 hour before bedtime)?
• Did I do gentle stretching/massage before going to bed?
• Did I consume caffeine/nicotine/alcohol during the evening? (“No” should be the goal.)
• Is my room cool, dark, and quiet?
• Have I recently spoken with my doctor about my iron levels?

Restio is a drug-free orthopedic aid that is worn on the foot. It can be used practically when an episode is felt to be approaching or during an episode. People who also experience these symptoms in their arms or hands may generally use the product by wearing it on their feet for supportive purposes. (Individual experiences may vary.)

Explore the Restio product page →

Note: This is not medical advice.

References

1. American Academy of Sleep Medicine (AASM) – RLS management and lifestyle recommendations (clinical guideline summaries).
2. Silber MH, et al. The Management of Restless Legs Syndrome: An Updated Algorithm. Mayo Clinic Proceedings – practical approaches to iron assessment and increased symptoms in the evening/night.
3. NIH / National Institute of General Medical Sciences – Circadian Rhythms (the internal clock and the effects of light).
4. Cleveland Clinic – Restless Legs Syndrome (RLS): Causes, Symptoms & Management (sleep hygiene and triggers).