Should I wear my Apple watch to bed?

Unless your bed is a lot more abrasive than mine no harm will come to your watch. My Series 3 has been on my arm every night since I got it October 2017 and the screen is almost perfect.

Yes that could happen if you are sleeping in hay. I wear mine all the time. No issues in 3 years. Ta

I want to wear my Apple watch to bed, but my biggest concern is it getting scratched or damaged during the night.

Unless you've installed a third-party sleep monitoring application, there's not much reason to do so. But, unless you or your partner also wear lots of jewelry to bed, it shouldn't hurt anything.

If a watch could get scratched by your sheets, it could get scratched by your clothes.

So far, my favorite sleep app is AutoSleep.