British charity group, Centrepoint, invited their royal patron to share the experience of a young person sleeping rough on the streets on December 15.
Prince William spent the night along with the prince's private secretary on cardboard boxes next to Blackfriars Bridge in London.
"I cannot, after one night, even begin to imagine what it must be like to sleep rough on London's streets night after night," Prince William was quoted by Sky News.
"Poverty, mental illness, drug and alcohol dependancy and family breakdown cause people to become and then stay homeless.
"Centrepoint's work — along with many other organizations' — in tackling these fundamental causes is desperately important if we are ever to end homelessness in this country."