Do you people realize that civilization as we know it has been created from mistakes.
Your memories help you live the future from your mistakes in the past. People whom have died are some of our best teachers and will continue to live through our memories. That is how people live on beyond their death.
As for weird sounds in hallways, stairs etc. are just what ever you want them to be! <<== It's your choice, relax enjoy and live your life happily.
You got to scare yourself 1st to become scared!!

The best teacher in life is yourself since if you do not want to learn something no one will be able to teach you so believe in what you may, you taught yourself to believe what ever it is!