Methods:
Thirty-two volunteers of the Royal Netherlands Air Force (RNLAF) were
double-blindly administered modafinil, caffeine, and placebo on three
non-consecutive trial days after being awake for median 17 h. Afterwards,
subjects completed six series of the Vigilance and Tracking test (VigTrack),
psychomotor vigilance task (PVT), and Stanford Sleepiness Scale (SSS),
yielding six primary endpoints.