So tired

I can't stop yawning.  I got a little more sleep last night, but I'm still so tired.  I think it's the blood pressure meds, that's part of the reason I stopped taking them the first time.  I mean seriously, today I am yawning like crazy.  And not just little yawns.  Great big, stretch-your-mouth-wide-open yawns.  While I'm sitting, while I'm standing, while I'm walking, while I'm talking, while I'm typing this, while I'm drinking my coffee.  Earlier at work I caught myself dozing.  It's embarrassing.  I'm lucky nobody saw me (as far as I know).  Maybe I'm just extra tired from working a 12 yesterday, I don't know.  Maybe I'll feel better after another night's rest.