i would say that its more of mixed feelings than regret alone.
especially if you r sleep-deprived, will start to think that way.
this is something unhealthy though, because it is something negative, negative feelings has its side-effects, or rather consequences...but as long as we stayed on the right track, just complain abit about this and that it is still alright.
just like sometimes when our child is sick, you will feel sympathy and restless the whole day too? Canx concentrate on work even..
And also if sometimes we quarrel with husb we will also feel regrets for marrying him....its the same idea.
so if you asked me i would say yes, i do feel the same sometimes.