Having sleep issues, I set up a Zoom H4N pro inside a 1meter cardboard box to track low frequency (sub base) noise disturbances and was blown away. Tracked many culprits down and still working on a few (need new windows and pushing landlord upon that). But instances of say another flat up in the wee hours banging about, you get a loud thud, you awake and none the wise and with my setup, was not only able to identify that but have evidence to prove that. Even had instance of waking up chocking, which was again due to a short loud thud noise disturbance by another flat.

Equally, noticed changes in flight paths by local airport are seeing some flights use the flight corridor (flying over the country so not originating or departing) at night that also cause resonance in the building.

For my part, I've got insulation, added sound dampening to curtail resonance and some frequencies and sound proofing to best I can. Though low frequency noise is hard to cut out beyond source due to the wavelength and a 100mhz low frequency noise you feel( well I do) and that's a 4 meter long soundwave. So hard to block fully, hence rubber dampening strips to curtail harmonic resonance with the building and in this case, my bedroom which is 4 meters in length.

Sleep is totally very important for physical and mental health and as somebody who is autistic spectrum, it is key to have a routine with sleep playing a huge factor in this.

But I highly recommend recording you night and playing it back and analyzing it with something that you can do spectrum analysis. As seeing a noise trigger you into breathing difficulties, or heart palpitations, or snoring is not good for ones health and being able to identify the issues and address them goes a huge way. Not all issues you can address thru the process's at hand afforded you, but many can and proof is a great asset in progressing that. Not sure if phone best tool to do that as not had great luck myself with those for tracking noise issues, unless blatantly continuous and loud due to microphone's and noise cancelation in such devices as well as varying quality of devices. Equally recording low frequency sounds is not the easiest and in my case, a field recorder inside a box has done the trick nicely, though it is an area of experimentation/learning for myself and still something that may be a better solution. But for me as I had a field recorder, a large cardboard box was a nice cheap modification that did the trick good enough.