I find with most of my meds there is a window of effectiveness. If I take my baclofen, I MUST turn off the TV within a 2 hour window or I miss out and cant drop off. I may not be sleepy, but if I close my eyes, and pretend I can get there. If I leave the TV on or ignore that window there is no way I am sleeping. I can feel how tired I am but there is just no way to drop off.

I am the same way with xanax, pain pills, muscle relaxers and so forth. If I dont honor the window I am awake.