‘Why do I have restless legs at night?’: Ask a doctor

For some people, sleepless nights can be caused by racing thoughts, reactions to caffeine or overstimulation from using devices too close to bedtime. 

But for those affected by restless legs syndrome (RLS), getting quality rest can seem impossible.

RLS is a nervous system condition that causes an irresistible urge to move the legs, often accompanied by tingling, pain, numbness or a sensation of "pulling."

'HOW MUCH SLEEP IS TOO MUCH?' ASK A DOCTOR

Fox News Digital spoke...