Possible Clues:

• ''We are such stuff / As ...... are made on'' (The Tempest)
• ''Sweet ---!''
• Not conscious of having hundreds of hundreds of sheets
• How the doctor gets the same twist while asleep
• 500 x 500 sheets of sleep?
• They may occur during sleep
• Deputy head with masses of paper getting dark thoughts
• Freudian concerns
• Nighttime visions
• 'We are such stuff as ... are made on' (The Bard)