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Artificial light has a huge effect on drowsiness for me. This is quite noticable when I am out in the woods, camping in a tent. After sundown, I have about an hour left before I get so drowsy that I cannot keep my eyes open. Back home, indoors, I can stay awake almost indefinitely.
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What about female lions?
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Watch birds they fly when they want. Or you can be a slave worm bound to the earth. The choice is yours
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If you watch birds you will see they don't use alarm clocks nor go to work, but still find food each day.
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