"i was taking lunesta, which is fantastic, however blue shield would not cover this drug until i first tried regular ambien and then ambien cr (in that order). regular ambien only put me asleep for about 2 hours. ambien cr would work for a full night. however, both versions of ambien gave me a dull headache as they were taking effect. the next 1-2 days following, i&#039;d be in a really foul mood, depressed, anxious, and a real &quot;fight picker&quot; with others. no such problems with lunesta. luckily, my employer switched to blue cross, which does not pay for ambien cr but does pay for lunesta, so i&#039;m in luck. i wish these insurance companies would just let doctors prescribe whatever works..."