I get some pretty intense déjà vu sometimes, lasting almost 10 seconds. I experience three different types: when I feel like I've been in the situation before and can predict what is going to happen, feeling like I've seen something MORE THAN once before, and like tigerstar186: witnessing things from dreams. Déjà vu is very fun and interesting. Anyway, it's difficult to decide whether we can browse alternate dimensions and times of our life. Even if we think we have (iin our dreams) there isn't a way to verify them. Whatever experience we undergo, through dreams or otherwise, however and wherever, I think what truly matters is how we respond to them; in order to positively advance our lives.