Well, even if you keep the bottles upright for a while, the sediment will move when you lay them down. It's not going to stick where it first settled- it'll move to a gravity dependent area.
As was alluded to, you probably bottled a bit early, and the wine is still throwing lees. It's not harmful. What I would do is set the bottle upright the day before serving, so at least most of the sediment is on the bottom, and then decant the wine before serving so that the sediment stays mostly in the bottle.