Why am I not able to stay awake during lectures at university? Lectures I find r

Question

Why am I not able to stay awake during lectures at university? Lectures I find riveting and most of the time, there's not much else I'd rather be doing than listening to my professors talk about receptor theory or neurophysiology. The same as when I'm driving at night, my eyelids droop and I fall into microsleeps before just putting my head down on the bench and sleeping (not while driving!).

It's not so much sleep deprivation either; I get enough each night (unless there's an assignment due in the morning).

Lots of people I've spoken to have the same experiences - long, inactive periods leave them unable to stay awake. Why?

Explanation / Answer

Well, I think part of the reason is that lecture theatres generally seem to be quite dark. So we know that blue light actually stimulates your brain and your body to wake up. It does this by affecting this little region in your brain that

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