ResMed, in San Diego, California, ranks second in the U.S. market for devices that help people suffering sleep apnea, a disorder that affects the breathing.

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Hydrazine is similar to chlorine or ammonia in that it affects the lungs and breathing tissue.

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It affects voluntary muscle activity including speaking, walking, breathing, swallowing and general movement of the body and usually causes progressive disability.

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If snoring is combined with feeling sleepy during the day and experiencing pauses in breathing during sleep, people may be suffering from the more serious sleep apnoea - which affects 10 to 20% of snorers - and should see their GP.

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