Historical clue formulations

• Got some shut-eye? — 2023-12-03
• Signaled slyly — 2021-06-06
• Gave a sly signal — 2010-10-17
• Sent an eye signal — 2009-11-09
• Indicated "Just teasing!" — 2007-11-23
• Signaled slyly — 2000-10-27