Thats interesting. In Sweden we have somthing called "snus", a non smoking tobacco in inch-large teabag-ish bags, that you put under your lip. It stings the lip a little (stings very very bad if you never tried it). I almost never go to sleep with a snus inside my mouth, something that pretty often happened by accident a few years ago, due to plain laziness. Maybe I should try to use it as a little helper on keeping me relatively concious? I wonder how the tobacco and nicotine affects ones abilities during an attempt to LD? I read somewhere that you shouldnt smoke a cigarette for at least an hour before going to bed, but it can actually be useful to do so, to make the lungs more relaxed. But snus involves no smoke, it just lays under the lip and slowly "drips" out in the mouth. I know it may sound really nasty and disgusting, but its something very common here, like smoking a hookah in middle eastern countries.

Some info on snus: