Historical clue formulations

• Informal bed — 2021-04-27
• Foldable bed — 2020-08-18
• Guest's sleeping spot, maybe — 2018-06-22
• Informal sleep option — 2018-03-18
• Informal bed — 2009-03-08
• Crash pad? — 2008-06-21
• Sleep on it — 2000-10-18
• Fold-up mattress — 2000-04-03