NGB
Did your Dr. not discuss other ways of improving your sleep patterns before prescribing the amitriptyline?
There are some very good alternatives to pharmacological intervention on this link:
http://www.themagicofyou.co.uk/brist...omnia-tips.php
I would recommend getting daily physical exercise (not 30 minutes before sleep as this could cause insomnia) and avoiding stimulants. It seems to me your insomnia may be stress related and you will have to identify what is causing that stress so that you can manage it and hopefully get a good night's sleep.
If you follow these tips you may not need your amitriptyline at night. DISCLAIMER: I would discuss any decision to discontinue your medication with your Dr. before doing so!