Can you please explain the bold?
Leonard: Funny expression, sleep tight. It refers to the early construction of beds which featured a mattress suspended on interlocking ropes which would occasionally… sleep tight.
Tara2 a mattress suspended on interlocking ropes You put the mattress on top of the ropes. CJ
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Tara2a mattress suspended on interlocking ropes
You put the mattress on top of the ropes.