About: http://webisa.webdatacommons.org/312979229

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	The deepest sleep, characterized by the highest awakening threshold, is observed during the 4th stage ??? it is very to difficult to wake a person particularly during this period.
http://www.w3.org/ns/prov#wasQuotedFrom	freakingnews.com