Inherently creepy, no, not at all. Frankly, it's a fairly benign and even kinda wholesome.

Though might I recommend using more disarming language when telling this to anyone who might be sleeping near you? Saying "I find snoring cute" or "I find snoring attractive" is more likely to put people at ease. Saying "watching them while they're defenseless" or "I wouldn't kiss you or worse", even with the most innocent of intent, tends to put too much emphasis on why you felt the need to clarify. Especially if they didn't ask. Which tends to put people on guard.

Assuming you already have that covered, then rest assured you are not creepy in the least. Just a person who has a thing for snoring. Which is, kinda vanilla, imho.

I don't think so. You are a type of "sleeper". A "sleeper" as I refer to it is someone who finds sleep comfort based on certain sounds or visuals. I came to discover this on r/futuramasleepers or whatever it was called. If I have Futurama, American Dad, Family Guy, or any WW2 or Vietnam documentary playing in the background, I'm out. Sleep like a baby. If its silent, my ears ring and I can't sleep. Any other TV show, I'm wide awake. Yours just happens to be people snoring. I also found it cute when women I dated snored slightly. Just really don't do creepy shit with this.

Stuff like this is often defined with consent. If you tell someone you like the sound of them sleeping and ask if they mind you listening to it, that's consent. If you're putting yourself around sleeping people to listen in without their knowledge there's no consent.

People love to watch/listen to babies and puppies sleep and coo and snore. Sleeping things look more peaceful.

More like a snooze-maxed and snorepilled sleepcel.

Just kidding. People tend not to enjoy when others are attracted to things they can't control, but on the other hand this way more acceptable than attracted to things people are more familiar with. You'll get given a lot of grace just for novelty. Just, you know, if it's a sexual thing then restrict it to only sexual contexts