Answer:

sleepier

Answer	Crossword Clue
SLEEPIER	Less alert
SLEEPIER	More inclined to drop off
SLEEPIER	More apt to nod off

SLEEPIER	More unwakeful.
SLEEPIER	Less active.
SLEEPIER	Less alert.
SLEEPIER	More lethargic.
SLEEPIER	Less bustling
SLEEPIER	Less lively
SLEEPIER	More likely to crash?
SLEEPIER	More heavy-eyed

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.