Restless Sleeper

Patient: With the AC somewhere between 78 and 80, my wife began wearing fall weather (long sleeve and long pant) pajamas, and covering herself with both a sheet and a warmer, fall type blanket.She insists she is not hot, but will fidget, mover her legs back and forth, toss and turn for up to four hours every night until she manages to throw the covers off and fall asleep; she is 40Any ideas? Could this be a medical or psychological issue?