In a randomized , double blind , parallel groups design participants received either placebo ( 0mg/day ; n = 16 ) , modafinil ( 200mg/day ; n = 16 ) , escitalopram ( 20mg/day ; n = 17 ) , or modafinil + escitalopram ( 200 +20 mg/day ; n = 15 ) for 5 days .