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| Author | Martin Day |
|---|---|
| Series | Doctor Who book: Eighth Doctor Adventures |
Release number | 70 |
| Subject | Featuring: Eighth Doctor Fitz, Trix |
| Publisher | BBC Books |
Publication date | August 2004 |
| Pages | 288 |
| ISBN | 0-563-48620-1 |
| Preceded by | The Tomorrow Windows |
| Followed by | The Deadstone Memorial |
The Sleep of Reason is a BBC Books original novel written by Martin Day and based on the long-running British science fiction television series Doctor Who. It features the Eighth Doctor, Fitz and Trix.