['healthy']
['ly3154207', 'placebo', 'modafinil']

        Inclusion Criteria:

          -  Overtly healthy males 18 years of age or older who have given consent and are reliable
             and willing to make themselves available for the duration of the study and are willing
             to follow study procedures

          -  Have a regular sleep pattern with routine time spent in bed between 6.5 hours and 9
             hours each night

        Exclusion Criteria:

          -  Are shift workers who shifted work within 14 days prior to screening or plan to during
             the study

          -  Have a known sleep disorder or history of a sleep disorder

          -  Have traveled 2 time zones or more within 7 days prior to screening or plan to during
             the study

          -  Regularly take naps during the day

          -  Are hearing impaired
      