Let me restate in case it helps folks to read more easily:
|reference:||3.7 - 9.5||0.4 - 1.0|
|6 mos. ago:||2.4 (low)||1.9 (high)|
It's not a pattern I'm familiar with, but I haven't studied the possibilities. It does look unhealthy.
My experience is with having super high morning cortisol and then too little at night.