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I think I might have the same problem you do.

I've tested my Cortisol 3 times, once natural and twice on TRT. Every time (blood drawn in the morning) it came back at the very bottom of the range, even slightly lower than bottom.

In the morning I'm completely unable to get up or do anything, I could sleep 12 hours straight, no drive, nothing. However throughout the day I get more and more of a constant "fight of flight" feeling, like my entire body's almost shaking from the inside.

So I'm thinking it's very possible my Cortisol values follow a similar pattern to yours; absolute bottom in the morning and maxed out the rest of the day.

I've never checked my afternoon/evening values, I'm gonna get this test and do the 4x/day saliva testing.