insomnia
"Doc switched me from ambien to lunesta after about 7 months stating that ambien is known to cause Parkinsons' longterm.  It worked similarly at first, but because of its long half-life i was told not to take another when i woke up early morning , 1-3 pm.  This is  big problem because i cannot get back to sleep.    Both 5mg ambien and 3mg luniest give me 3-4 hours sleep.  With ambien, Id awake and take another 5mg and go right back to sleep.  Now i can't do that anymore and seldom have any sleep quality after 2 pm.  Copper taste didn't bother me at first, but now a month later,  i notice everything tastes different, even water....was hard to pinpoint, but finally realized it was a metallic taste that was permeating everything i ate. or drank"