Community sleeping

I would like to know what happens some days that makes your kids think they have to sleep in the same room that you do. I have had my youngest waking up every 2 hours at night until she comes in and sleeps on our floor, for about 4 days straight now. Also with waking up around 6:30 am. I'm still bleery eyed at that hour in the morning. I noticed this morning as I moved Brie to the floor by our bed, that I almost stepped on our son, who decided to take his sisters cue, and join the floor as well. Not a problem, I just hope that I didn't kick him too hard in my half asleep state. I'm expecting Ali in the next couple of nights....