Ashwagandha is used to treat a number of disorders that affect human health including central nervous system (cns) disorders particularly in epilepsy stress and neurodegenerative diseases such as parkinsonâs and alzheimerâs disorders tardive dyskinesia cerebral ischemia and even in the management of drug addiction. The most useful usage is to reduce stress and perhaps aid in sleep. However if you take a high dosage or a concentrated extract you may not notice the relaxation effect as much.