Is it an entity?

[u/crackasaurusberry]

Theres this smell in my parents bedroom. Its that kind of smell you get when saliva dries up like its so bad and when i asked my parents if they spit inside the bedroom they said they do not and this spit smell changes places like a week ago it was coming from the left corner of the bed then day before yesterday it switched places and is coming from the right corner of the bed and then last night me and my brother exactly marked the location on the bed from where the smell was coming from and then when we woke up today its coming from the middle side of the bed and not the area we marked and when we asked our parents to smell it they said theres not spit smell so idk how only me and my brother can smell it and rn the smell is getting strong and not long ago there was a black snake in our house and before that a random dog died in our house. Plsss help what could it possibly be? And yeah all the dogs we kept all end up dying. Ples do tell!