Related Clues:

• With "slug," a lazybones
• Horizontal, perhaps
• Under covers
• Like many sleepers
• Out, maybe
• All tucked in
• Sleeping, say
• Between the sheets
• On the mattress
• Recuperating, maybe
• Not well, perhaps
• Supine, possibly
• Ready to go out
• Still asleep
• Laid up, so to speak