Yes, stars typically twinkle slightly.

Stars are unimaginably small point lights in the sky. They look like larger dots because of imperfect focus in our eyes [1]. But since they are in fact so tiny, it means very small atmospheric variation and obstruction—heat shimmer, floating dust, etc.—can significantly momentarily occlude the star. That causes its perceived brightness to vary over time.

[1]: https://en.wikipedia.org/wiki/Airy_disk

From atmospheric distortion they can appear to flicker, or “twinkle” as the song goes.

What are they for you?