Out of all the controlled studies brought out by the high-tech
scientists who have shown up so far in this ng,  the method of sound
masking, according to my experience, seems the most beneficial and not
a bit harmful.

I remember the time when my T was torturing me, I found myself
frequently going into the noisy streets in a small town in China in
order to listen to the high-pitched braking sound produced by the
bicycles.

For the past few months, I have been staying in a dormitory of a
Chinese school.  Behind the dormitory is a patch of large trees where
a lot of cicadas dwell.

A cicada is an insect "the male of which produces a shrill sound by
means of vibrating membranes on the underside of the abdomen".  The
weather here is very hot and humid, and I tend to dose into sleeping
at noon time.   Napping used to be very bad for my T but I have
discovered lately that napping in the midst of cicadas' vibrating
sound no longer bothers me.  And this has been true ever since I moved
into this dormitory surrounded by trees where  cicadas dwell.

So perhaps for those whom napping still bothers, they should try to
turn on a high-pitched sound device when they nap.  I suppose If you
could record the natural sound of cicadas', it would even be better.

FP