Eszopiclone
"10 days on Lunesta (generic).  Not sure why doc suggested I try it, as I'd been on same low dose of ambien for 3 years, good results.  Anyway, had the metallic taste, just annoying but I slept so ok.  After a day or so waking up more, sleeping less. Took an extra 1/2 last night -total 4.5 mg.  slept, but today all day major headaches and nausea. Not sure what to do tonight-wishing for backup benedryl.  Calling doc tomorrow-will request back to ambien."