The body relies on a host of nutrients to maintain proper biochemical functions. Electrolytes represent a few of the many minerals your body needs to sustain fluid balance between your cells so your nerves and muscles function adequately. You can maintain daily hydration and fluid balance by replenishing the primary electrolytes of sodium, potassium, calcium and magnesium along with drinking plenty of water. If you have low electrolytes or a specific electrolyte deficiency, you may experience nocturnal cramping and sleep disturbance.
Nocturnal Cramps
Nocturnal leg cramps are sudden contractions or spasms in the lower leg and foot muscles that awaken you from sleep. Cramping most likely affects your toes and calves, but other parts of your leg may also be involved. The condition may occur from dehydration and electrolyte mineral imbalance. According to the NYU Langone Medical Center, nocturnal leg cramps are generally harmless and easily treated. If you experience chronic symptoms and do not get relief from replenishment of fluids and electrolytes, check with your doctor for further medical evaluation; some diseases such as diabetes or thyroid disorders can cause leg cramping.
Electrolytes and Cramping
You lose electrolytes and water when you sweat; muscle spasms and contractions during exercise indicate you need to stop exercising to replenish fluids and minerals. A sports drink can help, but to prevent cramping make sure you hydrate before, during and after exercise and that you eat mineral-rich foods a few hours before your workout. Cramping unrelated to exercise can occur from electrolyte and fluid loss from excess urination, vomiting or diarrhea. A well-balanced diet including fresh produce, whole grains, nuts and beans can provide regular intake of mineral-rich foods to reduce the risk of electrolyte loss.
Specific Electrolyte Imbalance and Sleep
Nocturnal cramps can hinder your sleep, and sometimes low potassium levels are to blame. Eating plenty of potassium-rich foods like bananas, tomatoes, broccoli, cantaloupe, spinach or citrus throughout the day can reduce your risk of sleep disturbance from nocturnal leg cramps. Similarly, the sleep-disturbing condition called restless leg syndrome may have a connection to low levels of the electrolyte magnesium. Restless leg syndrome is characterized by unpleasant leg sensations including numbness, tingling and the uncontrollable urge to move the legs. Although the cause of restless leg syndrome is unknown, the University of Maryland Medical Center notes that preliminary clinical studies indicate regular dietary intake of magnesium can improve insomnia related to the condition.
Additional Considerations
Drink plenty of water throughout the day to meet the needs of your activity level. If you work in extreme temperatures, take small snacks and fluids to maintain electrolytes you lose in sweat. Limit your use of table salt, because excess sodium consumption can increase fluid and potassium loss. If you exercise, stretch your muscles before working out; you also might benefit from light stretching before bedtime to reduce the risk of nocturnal cramps. Chronic cramping or sleep disturbance can indicate underlying health problems, and you should consult your physician to determine the cause.
References
- NYU Langone Medical Center: Nocturnal Leg Cramps
- American Academy of Orthopaedic Surgeons: Muscle Cramp
- MayoClinic; Muscle Cramp Causes; July 2010
- Chemocare: Electrolyte Imbalance
- University of Maryland Medical Center: Magnesium
- National Institute of Neurological Disorders and Stroke: Restless Leg Syndrome Fact Sheet
