Materials
sleepiness
BLOOD
The Vigilance and Tracking test (VigTrack) is a dual-task that measures vigilance
performance under the continuous load of a compensatory tracking task. The test
has been used in various studies and is sensitive for measuring vigilance and
alertness (The psychomotor vigilance task (PVT) measures the speed with which subjects
respond to a red stimulus and is used to assess the vigilance of subjects (At the start of every trial day, a familiarization session of 5 min per task was
scheduled for all subjects to avoid practice bias during the actual
measurements.The Stanford Sleepiness Scale (SSS) was used to subjectively assess the degree of
sleepiness in subjects during the test days (Blood samples were taken four times throughout the night to determine modafinil
and caffeine blood levels (at After each test day, subjects were asked to complete sleep questionnaires about
their sleep on the day and night immediately following the test day and night.
After the last test day, the participants were asked to report which medication
they believed they had been administered on which night.