Though it may seem like a figment of your imagination, brain fog is a very real phenomenon. Though it's not yet 100% understood, researchers believe that brain fog is caused by factors such as stress, anxiety, and depression.
If you're experiencing brain fog, there are a few things you can do to help clear your head. First, make sure that you're getting enough sleep and eating a balanced diet. You might also want to consider incorporating some stress-relieving activities into your routine. Yoga, meditation, and journaling can all be helpful in reducing stress levels.
If lifestyle changes don't seem to be helping, talk to your doctor about possible interventions. There are a number of treatments available for anxiety and depression, and these conditions may be contributing to your brain fog.