My mother and I both experience this. Something I read a few years ago theorized that it was a case of part of the brain recognizing something or processing somethin a split second before the rest of it does, which makes a certain amount of sense, but I haven't followed up on it. My mother (and I, since I grew up with it) calls them 'true dreams.'

I don't know what the actual source or term for it is, but you are not alone

Edit: these instances also, for me, are usually followed by a vague knowledge of how the next few moments will go, and it's very surreal until the moments pass. Sometimes I feel like something horrible or important is about to happen; usually it doesn't. I was wondering, do you experience that, too? There are also some really interesting theories on the nature of time and perception that could contribute to it, in my opinion, but again I haven't followed up.