So every few months I go away for a weekend with a large group (100 people give or take). We generally sleep in a camphouse, which has dorm-like accomodation with a few bunkbeds per room.
There are a few notorious snorers in the group. Previous experiences have made it so that I would prefer not to sleep in the same room again.
Last time, we arrived early, so we (me and my gf) were the first to claim a room. There were two beds left. Then someone, who is a known snorer, came and asked whether the beds were still available.
This is a tricky situation. I feel like it would be unpolite to flat-out lie about the beds still being available, but similarly, allowing would cause their own problems.
I personally am not a light sleeper (I'd describe it as being in a coma), but during the process of falling asleep, snoring can be pretty disruptive. This would definitely cause similar problems to the folks nextdoor.
How can I tell them that I don't want them to share my room without being offensive or impolite?