I'm afraid I know very little about sleeping pills and their addictive properties and I'd be happy if you can elaborate a bit on the addiction aspect. GABA mechanisms are very different from the ones thought to underlie "common" addiction so my understanding was that it is a different "kind" of addiction, i.e., it's not the clinical symptoms you would observe with opiates or psychostimulants, but an inability to fall asleep without them.
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