how do I know if my kitten third eyelid is showing?????

I know that it means that she can be sick or ill in some way..but would I be able to see her third eyelid all the time like when she's looking at me or walking around? I'm asking this because yesturday I noticed while she was laying on top of me I was petting her to sleep when I touched her near her nose she opend her eyes slowly and I was able to see her third eyelid so I waited awhile and then did it again and saw her third eyelid again..I don't see her third eyelid when she's looking sraight at me only when I pet her near her nose and she will close her eyes and open them slowly then I see it..is this something to worry about??? Does this mean she can be sick? I never delt with anything like this any advice is appriciated

Oh and by the way she is 6 months old, spayed, and up to date with all her shots. Eats normal and drinks her water

It's normal to see it sliding away when a cat or kitten wakes up, but once she's awake it shouldn't show.  Sounds like she's fine.

Oh great!! Thanks for the quick response I was worried

If she's eating normally, drinking normally, using the tray normally and playing normally she's probanly fine.  Just checked with my healthy cat whose come for a cuddle, his membrane comes up if I touch his nose.  I believe it will be to protect his eye if something nasty is about to happen.

I agree. It's very normal when their drowsy to see the third lid. But once they give that big yawn and stretch you should no longer see it.

I feel a lot better thanks for all the edvice!!!!!