We had a fake tree every year until last year. I had the itch to get a real tree like I had growing up. We bought a beautiful tree that was almost 9 foot tall and had a 3 foot radius base. We bought a sturdy stand and I trimmed the bottom boughs off so we could get it in the stand. We strung the lights and garland and hung all the ornaments my wife had on it, most of which were collected over the years. It was set up in our master bedroom right in front of the window so that she could show it off.
That night at about 2 am, we hear this HUGE crash as the tree fell over and smashed about half her ornaments. We still don't know what happened to cause the tree to shift like that because we didn't have a cat any more and the dog was in his cage. Nobody was up (at least until the crash!) at that point, but let me just tell you between the loud crash right next to me and stepping on broken glass ornaments in bare feet, I was awake QUICK.
Ouch! You'll have to safety wire those trunk bolts next time!