I love candles. However, it is imperative that they be worked correctly and safely. I recommend from having burned many:
1) Don't fall asleep with a lit candle. That's an old superstition anyway. Just for extra safety. Snuff, don't blow, them out.
2) Never leave a candle lit next to a curtain or anything really. Leave plenty of space around it.
3) Don't stand them in the middle of a shelf or under anything.
One tragedy is too many and there have been more than one. Here are some more suggestions: