Microsleeps that recur and negatively influence day-to-day living often are clustered into the category of excessive daytime sleepiness. Thus, most clinical studies related to microsleeps are in the context of reducing microsleeps in excessive daytime sleepiness through the use of pharmacological interventions. Particularly, modafinil has become a popular drug to reduce microsleeps due to its stimulant effect with little to no side effects, and new drugs are often compared to the results of modafinil and placebo to assess efficacy (e.g. methylphenidate in Parkinson's Disease).