What is a common consequence of chronic sedative-hypnotic use?

In the context of chronic sedative-hypnotic use, increased tolerance is a well-documented consequence. Tolerance refers to the body's adaptation to a substance over time, where higher doses are required to achieve the same effects that were once obtained at lower doses. This phenomenon occurs because the body becomes accustomed to the presence of the drug, leading to changes in the brain's neurochemistry and receptor sensitivity.

As tolerance develops, individuals may find that their initial dosages no longer alleviate symptoms, such as anxiety or insomnia, compelling them to escalate their usage. This cycle can lead to greater dependence on sedative-hypnotics, increasing the risk of withdrawal symptoms and other complications associated with long-term use.

The other choices present outcomes that do not align with the established consequences of sedative-hypnotic usage. Decreased anxiety may occur initially but, over time and with increased dosages, individuals may experience worsened anxiety or rebound anxiety due to withdrawal. Enhanced REM sleep is counterintuitive, as sedative-hypnotics typically suppress REM sleep, and lower addiction potential contradicts evidence showing that these substances can be highly addictive.