MIT neuroscientist: 4 things I never do to avoid 'brain fog and forgetfulness' - CNBC

In addition to stress and lack of sleep, it can be caused by the immune system creating an inflammatory response in the brain.

Even if you think you're relaxed, your body may be physically tense (e.g., stiff neck, back or shoulder pain).

Studies also show that it can reduce levels of cortisol, which is the chemical produced when the body is under stress.

If that doesn't help me sleep, I do a "relaxation body scan," squeezing and releasing muscles — starting at my toes and all the way up to my head.

I strengthen my gut-brain axis by maintaining a diet rich in hydrating foods, healthy fats and digestible protein.

I also eat foods rich in magnesium — whole grains, leafy greens, dried beans and legumes — to help regulate my mood and sleep cycle.