Most sleep medications have recommendations for short-term use, yet sometimes they are prescribed over months to years.
According to this source:
You can have problems when you use them longer than 7 to 10 days.
Is there evidence for permanent alteration or damage to the brain with long-term use? For example, can it cause narcolepsy or extreme chronic insomnia? I could see the Z or benzos maybe cause permanent brain damage after an overdose. But what about chronic use at standard dosing?