I am writing a science fiction book geared toward the young adult audience. I am quite a ways into it (around one hundred pages) and am getting a bit bogged down in the world I've created. I've normally waited to do revisions on writing once I'm completely finished but am really tempted to start revising to check on my continuity and make sure things are flowing out the way I want them to. Is it alright to begin revision in the middle of a project and return to writing when I finish or should I keep writing and wait until I am finished to begin revision. Thanks for any help.