Eupace-L Tablet ER belongs to the beta-blockers class of medicine. Though their effect on sleep varies from person to person, it has been found that these medicines are known to alter the sleep pattern and disturb sleep in few patients. On the other hand, it has also been seen to promote better sleep in patients with increased heart rate and anxiety by calming down the heart and nerves. Do consult your doctor in case you have any sleep disturbances.