Cold showers for brain fog are great for waking up in the morning and actually lifting one's mood. Takes a bit to get used to (heavy breath intakes and shivering) but after you step out you feel alive and then, as you warm up ... awesome! I have been doing them for 4 days now - do it slightly "cool", to get used to it, then cool it down even more. I make it about a 3-4 minute affair. Seems to have cured morning "head fog". If you're new to it - get ready for a rush.