Possible Clues:

• Snake outside shelter unaware of what's going on
• Sawing logs
• When to strip, rising or resting?
• Takes the skin off a turn with one's eyes shut
• Takes the skin off a turn of unconsciousness
• Elapse (anag)
• Unconscious as the skin back there
• Snoozing when cover is pulled back
• Picked up skins one having dropped off
• Takes the skin off a turn of this while it's unconscious