"i&#039;ve been taking 1mg of alprazolam for years. new dr. gave me .05 of clonazepam. i am not sleeping with clonazepam. the first dose taken several hours ago. i have severe insomnia. because i&#039;m 67, doctor uses that as an excuse to not keep me on alprazolam which actually worked. tried melatonin,  nothing.  i seriously need sleep. how long does it take .05 clonazepam to kick in"