I missed one econ exam (the final) because I forgot and was distracted by playing D&D.

I missed one NetCom exam because I was getting my precious half-the-required amount of sleep.

Same thing happened with the same professor for a different course. He gave me a zero the second time it happened. I managed to work my way back to a decent grade. I really liked that teacher too. Burning the candle at both ends really took its toll. I couldn’t do it now (I tried).