Answer:

alertness

Answer	Crossword Clue
ALERTNESS	Vigilance
ALERTNESS	Wide-awake nature
ALERTNESS	Vigilance.

ALERTNESS	Essential quality for a good athlete.
ALERTNESS	State of caution
ALERTNESS	Sentry's sine qua non
ALERTNESS	Opposite of torpor
ALERTNESS	Sentry's attribute
ALERTNESS	Product of caffeine pills