When the Sleeper Wakes

When the Sleeper Wakes is an 1899 dystopianscience fiction novel by English writer H. G. Wells, about a man who sleeps for 203 years and wakes up in a completely transformed late-21st-to-early-22nd-century London in which he has become the richest man in the world. The main character awakens to see his dreams realised, and the future revealed to him in all its horrors and malformities.

It was published as a serial, then as a book, in 1899. It was republished in a revised form in 1910 as The Sleeper Awakes. The 2004 Project Gutenberg title page displays on four lines that suggest a subtitle: The Sleeper Awakes; A Revised Edition of "When the Sleeper Wakes"; By H. G. Wells; 1899. The Library of Congress Catalog uses the subtitle.