I looked up "computer narcolepsy" (I've heard of this condition) but nothing specific on Google. I've actually had this happen to me, but it depends on when I play and how often.
I'm semi-retired so my normal "off-days" routine is get up around 6:30-7 AM, breakfast, bathroom stuff, then go get coffee. I get home, play from around 9:30 am-ish to around 12 or 1 PM, then quit for the day. One the 4 days that I work, I don't log in at all, preventing "game burnout".
Now, if I'm working a PP project (fortify this or that place), eventually I get sleepy. Doing the same thing over and over can have a hypnotic effect on you. Hell, driving a car for 4 hours can do that as well (which is why they have rest-stops along the way, stop, shake the cobwebs out of your head).
Point is, if you are getting sleepy, your brain needs to process something. It's why we sleep (brain re-wiring stuff). If, as you say, you aren't sleepy once you get up from the computer you're experiencing burnout. Leave it (and all games) alone for a few days. Eventually you'll WANT to enjoy it again.
Ever see those desks that extend up so you have to stand up instead of sit on a chair at the desk? Try one of those. Notice the difference in energy if you're standing instead of sitting? Yeah, that.
And this may help:
3 Ways to Deal With Computer Fatigue - wikiHow
Peppering your workday with short breaks, simple exercises, and proper nutrition will make a long day of computer work less exhausting. Along with perfecting your self-care routine, setting up your workspace correctly can eliminate fatigue...
www.wikihow.com
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I play at night (yea you will laugh and say that this is a reason) usually from 11pm-1am, it's mine game time, but not every day and as I said other games (mostly action ones like PoE MGSV) not makes me sleepy at all. Maybe some of you are right, colors of UI or staring at not many points while I explore rather than combat or doing missions coud be a reason... or simply ED hipnotize me! 
