I was reading a couple days ago that a chunk of recently re-discovered space rock, previously discovered, lost and now has been rediscovered ( how does that happen ? ) turns out it may hit us one day. The rock chunk thought to be a burned out comet that now resembles an asteroid, last seen, in 1960 is considered "potentially hazardous"
And it is a seriously large chunk too. More than 500 feet across. Some day, over time, it's orbit will shift and could cause it to hit the our planet. The rock is too dim to be seen by the naked eye from Earth, at least right now.
But don't lose sleep over it or anything. It will not be anytime in the foreseeable future. So go back to sleep and enjoy the extra hours rest tonight.