Tiny "Slugs"?

I live in an upstairs apartment that is kept very cool and dry year round and until last week I've never even seen a roach in my apartment. All of a sudden, I am finding these tiny light pinkish slimy things here and there, and now in my bed. Yuck!

I remembered what roaches look and feel like as adults but never have seen these snot size slimy cool wet ones though. I found them here and compared them to the pictures, I think they are baby slugs yet I can't find an answer as to why I have suddenly been infested with them or where they could be coming from. There's not even a slim trail nor any adult ones anywhere. I have searched my entire place and no signs of any slugs big or small. Where are they coming from and how did they get here?