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sorry if I repeat anything already said, as I scanned, not read this thread.. I guess I consider myself luck.. 20+ years ago, the Army taught me to function on as little as 2-3 hours sleep per 24... I can still function on the same, but when I'm off work & have no reason to get up, I've been known to sleep straight for 12-15 hours.
My diet is probably one of the worst.. usually eat a small b-fast, then a quick lunch (fast-food or sandwiches), then dinner whenever I get home (wife & kids usually sleeping or near there). I drink 2-5 cans of soda & at least a gallon of water/gatorade/powerade daily.. and am losing weight slowly..
One thing I did learn about a year ago, the quality of your sleep is just as important as the quantity. I bought a tempurpedic & don't regret it.. no more rolling over, no more backaches... most mornings I wake up in the exact same position I dropped. sorry to sound like a commercial, but I feel much better working a 14-16 hour day on 3, 4, 5, or 6 hours of sleep.
If you're still yawning during class, then your body is is tired or you're extremely bored. Assuming you're still tired.. make yourself get to bed 15-30 minutes earlier for 2-3 weeks & get up at the same time every morning (build a routine)..
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