Yep happens often to me and i could be doing something and all sudden it hits.
Yes that's normal.
Not everyone has experiences of deja vu, but it's reported that around 75% of people claim to have had some sort of incident of deja vu throughout their lives.
Scientific approach
Many scientists believe that deja vu can be attributed to an anomaly of memory. Although there is no possibility that a subject has previously experienced said subject, he or she has a strong feeling of a repeat experience.
Partial Perception
Another theory about deja vu involves a phenomenon known as partial perception. Under this believe, the subject's brain has experienced a glimpse of a situation before it's managed to fully perceive the experience. This gives the subject the illusion of having already experienced a situation.
The parapsychologist approach
Many parapsychologists believe that deja vu is the result of past life experiences. If a subject has visited a certain place in a previous life, they are likely to experience deja vu as a result.
Whatever your beliefs about deja vu may be, it's an interesting thing to experience. I often experience deja vu related to certain smells, and it can be quite irritating trying to place my finger on why I think I've had a certain experience in the past.
Here's a short video taking a closer look at what deja vu actually is:
Yes! It used to happen to me all the time! It really hasn't happened in a while though, but I am familiar with the odd feeling it has.
I haven't
Yes I do! Suppose I am in a situation then I feel it's happened with me before! I feel I've seen it in a dream yes...... It makes me feel that way!
Yes......and its so annoying