Carbon monoxide?

[Lifeaballache]

Could I just open a cylinder of carbon monoxide and fall asleep?

 

[Jrmull1993]

Provided that you were in an enclosed space, it's certainly a possibility. Carbon monoxide typically diffuses evenly through a room, so ensuring there is no airflow is a must to successfully CTB.

 

[Lifeaballache]

Interesting. Thank you.

 

[Lost Magic]

While I am no expert on the method, I think a tent would be a good place for CM poisoning.