Reading the info on this book above I''m not sure I've got the right one, but I'm pretty sure "Peter Ibbetson" by George Du Maurier was published in 1891 and not 1963, but anyway:
Peter Ibbetson is a romantic novel from the late Victorian era - poignant, melancholic and deeply nostalgic, with a paranormal twist. The plot makes use of the idea of a shared lucid dream in bringing together lovers who are otherwise separated in waking reality, by class and circumstance. Although a powerful love story, it also makes for a fascinating speculative exploration of the nature of human consciousness and the meaning and "true" nature of life.
I thoroughly enjoyed the story, but found myself having to get into low gear early on,... I guess we early twenty first century readers are just too impatient to cope with this amount of descriptive detail, being fed instead on a diet of dubious sound bites. The early part of the story is a particular labour of love concerning Peter Ibbetson, aka Gogo's, idyllic upbringing in 1840's Paris and it's impossible to imagine how such pellucid imagery can be anything but autobiographical. Although I found it a little difficult at first to slow myself down enough, it proved to be a real treat, and many a vivid image of a time and place completely unknown to me now remain in memory, as surely as if those memories were my own.
The story seemed to change pace about half way through becoming more briskly paced, with a series of dramatic events befalling the hero, who is orphaned and finds himself transplanted to London and the hapless foil of a wicked Uncle who ultimately proves to be his undoing.
The loss of Gogo's innocence, like the loss of the older pre-Eiffel Paris, is keenly felt, and the novel is steeped in a poignant search for times lost and the idyll of youthful innocence. The later tragedy of Ibbetson, when it comes, is heart rending, but the triumph, and the point of the story is in its transcendence.
Du Maurier was a cartoonist for Punch magazine, and original copies of the book carry his own evocative illustrations. For this reason, it's worth paying a little and seeing if you can find second hand copies online. Otherwise the text is available as a free download from Project Gutenberg or the Internet Archive. The free PDF versions do have the illustrations, but I found they fell a little clumsily into my e-reader.