Answer:

LIEUP

Answer	Crossword Clue
LIEUP	Stay in bed
LIEUP	Stay awake in bed
LIEUP	Act like a sleepyhead

LIEUP	Go into drydock.
LIEUP	Stay in bed, as an invalid
LIEUP	Fail at falling asleep
LIEUP	Remain in dock
LIEUP	Dock
LIEUP	Not be able to sleep

Crossword

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