Clue: Extremely deep sleep

Answer: COMA

Length: 4

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Similar Clues:

• Profoundly deep sleep (SOPOR with 5 letters)
• Deep sleep states (REMS with 4 letters)
• Very deep sleep (e.g. COMA with 4 letters)
• End of a deep sleep? (COMAOVER with 8 letters)
• Not a deep sleep (NAP with 3 letters)
• "You are falling ___ deep sleep..." (INTOA with 5 letters)
• Deep, deep sleep (SOPOR with 5 letters)
• Hardly a deep sleep (NAP with 3 letters)
• Deep sleep state (REM with 3 letters)
• More than just a deep sleep (COMA with 4 letters)