Is it necessary ? i find the regular background rhythm of a fan helps me sleep better like falling rain or rolling waves on a beach. No beach where i am so that's out.
That is a fan that does not have any parts lose in it. did a sound measurement about 3 feet below the fan and it said 50 decibels. That is at its slowest speed setting.
Crompton Greaves High Speed 1200 mm CEILING FAN White
I bought it locally at Rathna Fan house, Chennai but snapdeal too offers it at competitive prices. I have two of these in a 170sqft room and it's great.