1 Industrial Machine Fan, high pitch, soothing, relaxing, sleepy, fall asleep
2 Industrial Machine Fan, low pitch, soothing, relaxing, sleepy, fall asleep
3 Industrial Machine Fan, soothing, relaxing, sleepy, fall asleep
4 Industrial Machine Fan, soothing, office, sleeping sounds, relaxing, sleepy, fall asleep, fan sound
5 Industrial Machine Fan, soothing, relaxing, fan sound, fan for sleep
6 Industrial Machine Fan, soothing, relaxing, rotating fan, sleepy, fall asleep, sleepy sounds