re: At what point in life did you realize you were "old"

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But where as before I didn't slow down until 24-36 hours awake....and even then I could fight through it. Now I'm dragging 18 hours in. I can't hold my eyes open. I get fatigued and grumpy.

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Same here.

Used to be that after 24-30 hours of inhouse call, an hour nap plus a big cup of coffee and I was good to go.

Now if I don't get at least 6 hours of sleep, the first thing I think when my alarm goes off in the morning is "only X hours until i get to go back to sleep."

Actually the first thing I think is "frick" but you know what I mean.