Might be a bit inconvenient for Upjohn if they had to put a drug label warning side-effect on their sleeping pills...
"Warning - may cause suppression of rational brain function leading to homicidal outburst."
To be fair, it's pretty rare and likely limited to those who ignore warning labels about dosage. Unfortunately, plenty of people ignore those warnings and consume them like they're Tic Tacs on the reasoning that if a few tablets a day yield good results, then several times that dosage should yield several times the benefits.