I don't have any good sources for this, however I can say with certainty that soft radiation like WiFi or 4G affects the body negatively during sleep.
My sensitivity to energy is very high, and I sense WiFi, 4G, Bluetooth and whatever very clearly, like a wave of external force washing over the body.
During sleep, it disturbs the aura, and even when awake I avoid being too close to the source of these (Within 2 meters proximity), because I sense it pressing against my aura.
When calling, I always use loudspeaker or wired earphones, as placing my phone within 10 cm of my head exponentially increases this pressure, which doesn't feel right.
I can ignore this feeling if I have to, and prevent it bothering me, but it is an extra source of avoidable interference on your energy field/aura, which I prefer to avoid.
As for sleep, having my phone within 2 meters proximity to myself during sleep causes restlessness and lacking sleep, as well as a notable increase in negative dreams. I believe it causes vulnerabilities in ones aura which cause this.
Regular people aren't usually bothered by this, because their energy levels are so low it doesn't change anything for them, but as a meditator who seeks to maintain high energy levels and strong aura, it is a notable factor, mostly during sleep as that is the time ones aura is most vulnerable.
As I said, I do not have any good source, other than my own experience, however I trust my own experience more than any source on this, unless a Demon would tell me otherwise.
Hail Satan!