Ghosts

the links from the Youtube box,

What's Really Behind Paranormal Experiences (Hint: It's Not Ghosts)

can be found http://www.livescience.com/14904-paranormal-experiences-hint-ghosts.html

as well as,

Neurobiology of a hallucination

can be found http://scienceblogs.com/neurophilosophy/2008/09/11/neurobiology-of-a-hallucination/

 of course one of my Favorite scientists, 

Neil DeGrasse Tyson and Vic Tandy on Ghosts and Infrasound

can be found here, http://astronasty.blogspot.com/2011/10/neil-degrasse-tyson-and-vic-tandy-on.html

a discussion group talking about infrasound,

http://www.thenakedscientists.com/forum/index.php?topic=22591.0

and lastly 

Stages of Sleep

http://web.mst.edu/~psyworld/sleep_stages.htm

all of thease things put together will let you know my state of mind on the matter.