From the Daily News:
Hundreds of Long Island City residents are losing sleep because an MTA exhaust fan that sounds like "an air raid siren" is keeping them up at night, neighbors charge.
Residents of the swanky Citylights co-op and nearby buildings have been plagued by the loud noise every weeknight from 1a.m. to as early as 5 a.m. since late May, say numerous neighbors.
The noise is coming from a nondescript property near the building where the exhaust fan is located.
A Metropolitan Transportation Authority spokesman said workers are replacing rails in the East River tunnel for the nearby No. 7 train - and that nothing can be done to muffle the sound.