Answer:

hypno

Answer	Crossword Clue
HYPNO	Therapy lead-in
HYPNO	Prefix with therapy
HYPNO	Prefix for sleep

HYPNO	Word form for "sleep"
HYPNO	Sleep: Prefix
HYPNO	Sleep: Comb. form
HYPNO	Sleep, in combinations
HYPNO	Prefix relating 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.