Nothing to worry about...
That thing is basically a big transformer and creates magnetic fields. These fields don't travel far... not 100 feet
Like mentioned before the distannce is OK. Your monitor, your TV and your mobile in your front pocket of your trousers
is doing you more harm.
If you want to be on the save side, remove any electric appliances out of your bedroom.
Please don't go for these EMI detectors, that's bs or you have to spend several thousands of dollars...