What would cause someone to feel a brain fog?

You may be dehydrated, or need an infusion of glucose. I often feel like that when I wake up. Drinking water usually helps.

Low blood sugar, low blood pressure, being sick

Wow, lots of things. Not enough sleep, poor nutrition, recent exposure to cyanide gas, allergies, those brain altering microwaves the Chinese have (not) been working on. Have you tested for Radon..?? What about Lead?

Could be anything or many things all at once - poor diet, irregular sleeps, medications, dehydration, etc.

There's a fentanyl epidemic these days maybe some of it got on ya in the breeze. 🌬️

Allergies , feeling run down and stressed ?

if it persists, you need to get checked out. could be epstein barr but i am not a doctor.

I don't know, for me it's apparently "existing". 🙄

ngl the main cause imo is stress/depression

Me too… but I took zzzquil

Years of drinking does that to me

Probably getting sick

biden virus? 🤔

Eat something

Have you had Covid? These are recognised longer lasting symptoms.

More u sleep the tired u b. It's like eating too much turkey