Recent studies have found that there is a link between lack of sleep and different diseases. One shows that sleep deprivation may be one of the first signs of Alzheimer's disease (regions affected: cortex, hippocampus).
is defined as a chronic, relapsing brain disease that is characterized by compulsive drug seeking and use, despite harmful consequences. It is considered a brain disease because drugs change the brain.
Modafinil has been popularized by powerfully increasing the concentration of healthy individuals, as well as allowing the study or the accomplishment of tasks that require concentration for long periods.