Why is my gas alarm going off at 3am!!

I must confess i too wondered if the CO2 caused by sleeping crew could be responsible.
I bought a gas alarm last week and tested it by filling a bucket with a quick squirt of butane from a gas torch It worked very well.
I wonder therefore what would happen if you put said alarm into bucket and filled it with a squirt of CO2 from a fire extinguisher.

They specs from my alarm says it will detect CO, Butane, Propane, Coal gas, methane etc, and says "do not site close to galley area" Maybe CO2??
 
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