I don't believe that; for I remember a poor student I used to know told me he had such a conviction one day when he was blacking his boots, and I can't think he had ever lived in another world where they use Day and Martin.
Some think that Dr.Wigan's doctrine of the brain's being a double organ, its hemispheres working together like the two eyes, accounts for it.

One of the hemispheres hangs fire, they suppose, and the small interval between the perceptions of the nimble and the sluggish half seems an indefinitely long period, and therefore the second perception appears to be the copy of another, ever so old.
But even allowing the centre of perception to be double, I can see no good reason for supposing this indefinite lengthening of the time, nor any analogy that bears it out.

It seems to me most likely that the coincidence of circumstances is very partial, but that we take this partial resemblance for identity, as we occasionally do resemblances of persons.

A momentary posture of circumstances is so far like some preceding one that we accept it as exactly the same, just as we accost a stranger occasionally, mistaking him for a friend.

The apparent similarity may be owing perhaps, quite as much to the mental state at the time, as to the outward circumstances.
-- Here is another of these curiously recurring remarks.