Drug-related sleep disorders Insomnia and EDS can result from chronic use of central nervous system (CNS) stimulants (eg, amphetamines, caffeine), hypnotics (eg, benzodiazepines), other sedatives, antimetabolite chemotherapy, antiseizure drugs (eg, phenytoin), methyldopa, propranolol, alcohol, and thyroid hormone preparations (see table Some Drugs That Interfere With Sleep).