Will halcion (triazolam) work for insomnia if i have already been on klonopin .5 mg for several years for anxiety?

Different : Both medications are in the same class but otherwise are very different. Halcyon works very fast but gets out just as fast. As a result it is good at getting people to sleep but not at keeping them. If you are used to klonapin then you will likely wake up in middle of night feeling anxious. Also the sudden changes can lead to confusion. 0.5 is small dose so it might not be a big problem.

INSOMNIA: Getting good night's sleep is important for physical & mental health. Insomnia might be due to several reasons. Have a physical exam to rule out illness. If cleared consult with a Clinical Psychologist with expertise in multiple types of psychotherapy that helps you benefit from medication prescribed by a Psychiatrist. If uncomfortable with your Dr. seek 2nd opinion. You may need a sleep study.