It was an option in version 1.0 where you could check the bed in your innroom, and occasionally find items hidden in it, usually after waking up and having a notice that your character had a dream (after the final save maintenance you could even find random relic weapons in it). Because the word 'check' would often be mistyped as 'heck', it became a meme in the game to 'heck the bed'.
And yes, I'd love to have it back. :3