Restless legs syndrome is a disorder which interferes with falling asleep . While trying to fall asleep, a person suffering from RLS will experience sensations in their legs which can only be relieved by movement. The patient has an irresistible urge to move their legs.
People sometimes describe it like bugs crawling in their muscles.
When they move, the bugs stop crawling, but when they are still, the bugs start again. The sensations are usually felt between the ankle and the knee. Occasionally they can be felt in the thighs or feet and are rarely experienced in the arms. RLS appears to increase with age. Peak onset is usually middle age.