Pat Long was a journalist who was working at the Times and the Sunday Times before his death at the age of 41 in 2018.
He was working on a book about his experience of brain cancer and its effect on memory and personality, which his family is completing.
Five quirks of memory that can mess with your sense of reality.
When a brain tumour left Pat Long with persistent déjà vu, he began to question the very nature of reality. Here, he tells his story for the first time.