When to take sleep aid?

Can sleeping aids be taken every night for years?

I have Alteril, Somnapure and Valerian Root Standardized.

I notice some posts from people saying they've been taking Alteril or Somnapure or Valerian Root every night for years.

Somnapure even prints on it's info sheet "It's important to take Somnapure every night for the natural ingredients in Somnapure to help your body readjust to it's natural Circadian rhythms. The longer you take Somnapure, the more it can help you get the sound sleep you need."

I would rather be taking this natural product for a long time rather than a prescription sleeping aid, which has many side effects.

It depends upon the pill that you are taking.
Some medicines are kinda addictive and they exhibit severe withdrawal symptoms if you stopped using them.
I think Somnapure is a natural sleep aid which is made up of natural herbs and extracts. These will not do much harm to your body as they promise no side effects and habit forming.
Anyway, it is better for you to consult a doctor or pharmacist and seek advice regarding this matter.
All the best.