When I'm trying to sleep I hear a high pitched, ringing noise. I can only hear it if everything else is quiet. I've considered if this is a medical issue, such as tinnitus, but before jumping to conclusions I would like to check the room itself for sources of noise. Are there any tools available for doing that? I installed an app on my smartphone for measuring the sound level, but I don't think it's very accurate.
I know my baseboard heater sometimes squeals but I turn it off and can still hear the noise. Also my computers power supply sometimes whine but I tried unplugging it.
Why don't I just go somewhere really quiet to see if I can still hear the noise in my ear so I can find out if it's a medical problem or really is the house? There actually aren't as many places as quiet as the bedroom (but if you have any suggestions let me know). I've tried going to a library but even the shuffling around of people is nosier than my bedroom at night.