Sleep is a definite signal. If you've eliminated diet, medication, and personal relationships (tough one) as causes, you're left with professional obligations.

Sleep is a definite signal. If you've eliminated diet, medication, and personal relationships (tough one) as causes, you're left with professional obligations. Note too that "chronic fatigue" is NOT "lack of sleep". The brain fog is the net resultant of the body being in a constant "fight or flight" mode for too long. Psychologically, you've been doing WWI "trench warfare".