With a lot of these pills there is a withdrawal syndrome. Anything that's sedating, if you stop taking it, can cause rebound insomnia. The combination of knowing you haven't taken the drug, which is a psychological effect, and the lack of a pharmacologic effect, are both sort of pushing toward a poor night of sleep.
Quotes about sedating (2 Quotes)
Doctors will purposely keep his pressure in his brain under control by heavily sedating him so as not to raise the pressure and make the swelling worse.