We traveled with two single friends who didn’t know each other and shared a ship’s cabin. One had to get her own cabin because the other snored so loudly. I listened from the hall. You could hear it clearly and loudly.
Depends, mostly for the reasons others have already given.
Telling people allows them to prepare a bit - to remember to pack earbuds, for a start. I don’t take them as a rule but would if I were sharing with a snorer. Plus it would just feel better to have warning.
A long-ago ex of mine was such a heavy snorer that his neighbours in his block of flats complained! And one time he was on a camping trip in the snow - insane to begin with IMO, but I don’t like camping - all sharing one big tent, and his friends got so overtired and pissed off that they kicked him out to sleep in the snow. 
(He had a really good sleeping bag and a ground mat, but still, that’s extreme). I don’t know why I was able to sleep through it easily - not sure I would now.
I am the atom bomb of snorers, and I warn people to expect the worst if they are thinking of rooming with me.
I did also buy one of those mouthpieces that reduces snoring, and it works pretty well. I won’t wear it if anybody’s around because it’s not 100% comfortable, but I can handle it for a few nights.
I’m a snorer. I’ve been using the nose strips for years now and they work well for me. My wife isn’t woken up by my snoring anymore.
A few years back we were in New Orleans and I forgot to pack them. I found the local pharmacy and pick some up so my wife could sleep. They also seem to help me wake up with less congestion in the pollen seasons.
I guess I don’t get it. The chances of me spending the night in a room with a Rando is virtually Nil.
Doxie the Dog snores, but I can hang with that. I only have to put up with his nocturnal business in the camper.
I said depends as well, without looking at the comments. My husband knows I snore sometimes, and it’s directly correlated to how disciplined I am about exercise. The more frequently I get on the treadmill during the week, the less it happens, so I try to work out a minimum of 4-5 days/week. I’ve been good about it lately so I’m told I don’t snore often now.
Regardless, if I were sharing a room with someone I’d never shared with before, I’d absolutely tell them. I keep a couple sets of unused disposable earplugs in my bag (noise levels where you travel can be unpredictable and, even when I’m not traveling, if I do something like go to the movies with my kids, really loud bits can bother them), so I would offer a pair.
If I can I try never to share a room with anyone other than my husband, primarily because I find it hard to sleep with anyone else (I’m really self-conscious about the snoring, even if I haven’t snored for a while) and, if I’m alone, it’s a huge treat not to have to talk to anyone for a few hours.
The only reason I’ve shared a hotel room with anyone other than my wife, or a couple of close friends, in the past few decades has been when I’ve gone to gaming conventions. Even then, it’s never with a total stranger, but it’ll sometimes be with a friend with whom I’ve not previously shared a room, or a “friend of a friend” (“Dave needs a place to crash tonight – is there space in your room?”)
There’s a difference between sharing a room with a rando and sharing a room with someone you’ve never shared with before. My husband goes on 4-5 bowling trips a year with a group that generally ranges from 20-40 people. All of these people know each other - but they haven’t shared rooms in every possible combination. If Joe and Bob have shared a room on the last 20 trips, but this year Joe can’t go and Bob ends up sharing a room with Bill that’s not necessarily sharing a room with a rando - Bob and Bill may have known each other 20 years and simply never shared a room before.
And anyway , there’s always a first time- even though Joe and Bob have shared for the last 20 trips there was a trip that was the first time they shared.
I’m confused by the people who see no daylight between “person you’ve shared a room with before” and “rando.” I travel with friends all the time, and there always has to be a first time with each of them.
I think it would be the considerate thing to do.
Fortunately, I don’t have that problem. I’ve stayed awake the entire night on 3 different occasions just as a test, and I heard nary a sound.
I can’t decide how to answer this because I hardly ever travel with anybody who doesn’t regularly sleep in my room. For the last 15 years or so, the only person I’ve ever shared a bedroom with has been my wife. On business trips I always get a hotel room to myself. When I was a lot younger, I would on rare occasions share a room with a friend or a cousin, but honestly I don’t think it’s happened in 25 years.
Yeah, I don’t understand why people think that apparently you have already slept in the same room with every single person you are friends with. 
It’s so bizarre. Just because I’ve known someone for 20 years doesn’t meant we’ve slept in the same room.
It’s not that. It’s that I never sleep in the same room with a friend. Not ever.
Well yeah exactly, that’s the point, so you wouldn’t know if your friend snores or not. They aren’t “some rando.”
Last night our field spaniel, Pluto was snoring in the family room until I exclaimed “Woogams!” and he stopped immediately, without awakening.
It should work for traveling companions too.
You need to be pre-emptive when sleeping away from home: a sleep mask because rooms may not be dark enough (the gap under the door is sometimes so large that it’s plenty bright in the room); earplugs against the trucks rumbling by on the interstate 50 feet from your window, OR the people in the next room (paper thin walls) who leave the TV on all night for background noise OR the plumbing sounds; I even take my own pillow because even though I specifically ask for fragrance free rooms/sheets/towels, it don’t happen near enough. Your motto should be: I GO ON THE OFFENSIVE FOR SLEEP! (Not really a catchy T-shirt, sorry.)
Meh. I sleep just fine with the lights on, and the noises you describe don’t keep me up even without earplugs. The friend who inspired the OP, on the other hand, was so loud he kept me up despite earplugs. I don’t think your solution is adequate for all situations.
None of those things keep me awake either - but my husband’s snoring did. ( until he finally got a CPAP) I’m not sure what it was exactly about the snoring that was different - probably something to do with the rhythm- but it kept me awake even though traffic and TVs ( even in the same room) don’t.
Yeah I agree, earplugs should be an essential travel item for everyone - they hardly take up any space and you never know when you might need them.
That being said, I also agree that if you know that you’re a heavy snorer the courteous thing to do is to give people a heads up about it if they don’t know. I only ever recall one of my friends having ever given me the heads up about their snoring though (out of at least a half dozen who I consider to be heavy snorers), so even if it seems to be common sense on this board, it doesn’t seem to be elsewhere. Good thing I always pack earplugs!