Tamazepam (Restoril) is a benzodiazepine in the same class as Ativan, and similar to Valium. All these drugs cause muscle relaxation, along with sedation. So, I think that is what you are experiencing. It absolutely does not affect inflammation, just your perception of the symptoms.
It is a good thing. Just be aware that these drugs are habit forming, and not without other pitfalls.
Jan