sleep tight

the expression "sleep tight" has its origins in bed design.

modern frame style beds (like the one i am sleeping on) have a headboard, a footboard, and rails at the sides, with ledges that support some kind of lateral struts for the mattress to rest atop. previously however, beds had the headboard, footboard, horizontal "rails" but no slats. instead they had ropes that were held in place and tensioned. before sleeping one would tension up the ropes. hence "sleep tight"

go tell your friends some random facts !

sleep tight!