"i used 10 mg zopidem for 7 years. it worked like a charm.  i went from 10 to 15 to 20 mg of this new stuff.  nothing. i&#039;m just going to have to go one week belsomra and 45 mg mirtazapine and one week zolpidem. i had such high hopes. but doesn&#039;t get rid of my sleep anxiety."