I have been on Armour for years and although my waking temps are constant 98.6 my night temps drop to 97.8. Recently, I found I had underlying adrenal fatigue and started taking dessicated adrenals and some adaptogenic herbs such as ashwaganda and eleuthero root. This brought my temps up. You can do a 24 hour saliva test for Cortisol levels. Also check Dr Rind’s website about how to check if your temps are “stable” over a 5 day period.