Originally Posted by COLT
That's a great question and unfortunately I can't answer it specifically but I can toss out some ideas.
The first thing I would say is that you're working like a horse. Two horses. I think it's natural to be tired and sleepy after the effort you're putting in.
My guess is that you're suffering from some sleep deprivation. So all it takes is a little bit of a nice warm, full feeling and your brain is going to click off and get some needed rest. You're probably also suffering from stress and have a bit of "combat fatgue." You're just on too many hours and your brain needs a break.
I have literally seen guys who have been in the field for days, humping 80 lb packs, just lay down and go to sleep in the rain and even sleep standing up.
We also know that any food containing high levels of carbohydrates will induce the sleepy feeling (and the "happy feeling.")
I don't think anyone is really sure why, but most believe that it's because glucose loads in the bloodstream (the sugar produced by carbs) triggers the production of serotonin and other chemicals and compounds.
We know serottonin is the body's happy drug and among other things it does, it controls your ability to sleep well.
There is also a mechanical effect of the blood rushing to your gut after you eat and this causes a slight decrease of flow to the brain. Less blood means less oxygen. Less oxygen means slightly less alertness and you "feel sleepy."
I would like to say to you : Just exercise more, don't drive so darned much and go on a low carb/high protein diet and see if it makes a difference.
But that would be grossly irresponsible.
You need to talk to a doctor and have him run simple tests to rule out anything else. I'm 99.99% sure from what you said that it's your situation causing the sleepiness, and that there is nothing else, but a doctor will make you 100% sure.




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