Does temazepam cause memory loss

I have been using Melatonin 3mg for the past 12months almost every night, as I had suffered from palpitations and could not get to sleep Melatonin was the only natural remedy that worked.

For the past 2 months I have noticed a decline in my short term memory and ability to grasp simple everyday Words in a hurry, I worried that this may be connected to my long term use of Melatonin and have for the past week discontinued it's use, no harm to give it a break for a while.

I want to see if after further non usage whether my memory etc improves.