Possible Clues:

• Not alert
• Out at the switch?
• Do not start developing relapse whilst in the Land of Nod
• Snake securing shelter, being coiled up?
• Takes the skin off a turn to unconsciousness
• Not a good thing to be at the wheel
• Takes the skin off a turn of being unconscious
• Snake takes shelter when hibernating
• One strips off reflectively, in a dream?
• A steady start - bound to be heard out