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Answer for the clue "Royal Opera House deployed piano only, a real sleep inducer ", 8 letters:
rohypnol

Word definitions for rohypnol in dictionaries

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1995, trade name for a powerful insomnia drug.

Usage examples of rohypnol.

If he could get his hands on rohypnol, what other drugs did he have access to?