Restless leg syndrome can keep you up at night, causing burning or throbbing sensations in the legs that make it difficult to stay still when laying down . The uncomfortable condition impacts one in 10 Americans and women are twice as likely to be affected as men. But experts say that the neurological disorder is often the sign of something that can lead to serious complications. Iron deficiency, also known as anemia, can impair our ability to produce the happy hormone dopamine, which regulates leg movement. Deficiency can lead to shortness of breath, brain fog, a racing heart rate and heart failure . Adding more iron to your daily diet can help you reduce the risk of these complications - and get better sleep at night, Dr. Brian Chen, a sleep specialist at the Cleveland Clinic , said Thursday. Many American women suffer from restless leg syndrome linked to low iron levels.…