Cognitive fatigue is common after a brain injury, whether mild, moderate or severe.
The brain is working harder to keep up all its functions, even ones that were once second nature. Eventually it is like an overload button, the brain needs a rest. Without rest it can lead to headaches, or becoming irritable, confused and sometimes increasing problems with behaviour.
What can you do about it? Well even understanding what it is, gives you clues about how you could assist a person manage it. Here are some ideas to get you started.