restless legs syndrome
"I have dealt with RLS for a number of years. I suffer from insomnia  but I would take melatonin, Lunestra, Ambien and they did nothing but aggravate my RLS worse.  Nothing like being tired AND agitated because of the constant need to move my legs.  I had to have a hysterectomy in April and they sent me home with Tramadol after a week I noticed I had not had an RLS episode for the entire week.  I didn't take it one night because I wasn't having any pain from surgery...RLS kicked in.  Realized the Tramadol was keeping the RLS at bay.   If I don't take it before the RLS kicks in, it's not quite as effective."