Possible Clues:

• 'To ___—perchance to dream': Hamlet
• The Smiths' debut hit
• Fail to stay awake
• Hypnotist's word
• ''The best meditation,'' per the Dalai Lama
• Result of counting sheep, perhaps
• Insomniac’s need
• Drunken stupor recommended by James Purdy?
• Hamlet's word before 'perchance to dream'
• Siesta