However, if you are like me and you ferment your cider in your bedroom (just in case you need a tipple at 3am and can't wait for it to finish fermenting) then the constant 'plop' 'plop' from the airlock might drive you bonkers.
It certainly drives me bonkers.
Step 1: Make a Muffler
I won't even have a mechanical clock, ticking in my bedroom so the cider equivalent is unwanted too.
I took a towel and folded it a few times to make a muffler.
Step 2: All's Quiet on the Cider Front... Almost
This won't create a seal so the carbon dioxide can still pass through the airlock and the 'plopping' is deadened somewhat.
My demijohn is in my bedroom cupboard and with the muffler in place, I get a good night's sleep.