Perhaps this is just paranoia and lack of scientific knowledge, but not knowing concerns me, and I’m reluctant to just trust what is generally held to be true
There's not a lot out there that would support non-ionizing radiation causing widespread health issues. Most of it is targeted to specific individuals or diseases.
There are some studies that show EMF from high-tension lines can slightly increase specific kinds of pediatric cancers, but don't show the same effects on adults (UK study of about 6000 kids was the best I've seen). There have been several papers suggesting a link between exposure to cellular frequencies and wifi and decreased sperm count. There has also been research suggesting a link between cell phone use and specific types of brain tumors.
I wouldn't be too concerned. You can take basic measures to reduce your exposure by small changes. Using speakerphone instead of holding the phone to your head, or sleeping with the phone on the other side of the room for example (understanding that the RF radiation is about 1/4 the original power when you double your distance from the source is helpful to estimate your reductions). You can schedule your router to turn off the wifi durning the hours you normally sleep. Use ethernet instead of wifi whenever possible.
Those radio bands have been used in use long enough for use to know that there are no designable health effects on people. If there were then we would expect to see higher numbers of cancers in people that own cell phones, or live close to RF transmitters. Mobile communications signals are simply not strong enough to influence the electrical signals in the brain.
People are exposed to much higher levels of radiation in the form of light. In the US alone, 9500 people are diagnosed with skin cancer every day; a large number of which is caused by exposure to UV largely from the sun.
> The WHO/International Agency for Research on Cancer (IARC) has classified radiofrequency electromagnetic fields as possibly carcinogenic to humans (Group 2B), based on an increased risk for glioma, a malignant type of brain cancer, associated with wireless phone use
For reference Group 2B is defined as "Possibly carcinogenic to humans" and includes among other things:
- Aloe vera, whole leaf extract
- Pickled vegetables (traditional Asian)
- Acrylic fibres
And has lower risk than level 3 tha tincludes
- Coffee
- Tea
- Ceramic implants
- Dental materials
- Fluorescent lighting
[0] https://www.iarc.fr/wp-content/uploads/2018/07/pr208_E.pdf