About: http://webisa.webdatacommons.org/130613988

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Wish I could give you a better answer but I know of no cause other than the sleep disorders or abnormalities (such as sleep deprivation), yet those need not be present at all for it to occur.
http://www.w3.org/ns/prov#wasQuotedFrom	dreamviews.com