Mental fatigue

Fatigue is a common problem involving the physical and mental state, where a person feels helpless and weak. Physical and mental fatigue are different, but they usually occur together.
With mental fatigue it is more difficult to concentrate. A person can feel drowsiness, reduced level of consciousness, reduced attention, headache, etc. Usually after some rest (relaxation of muscle tension, resting mode, sleep, oxygenation of the organism, etc.), this fatigue disappears in a short time.