I've not read the article yet, but I'm going to assume it's affecting my sleep because I'm reading about how it's affecting my sleep at 04:21 instead of, you know, going to sleep. Just a guess
It's that, plus "notifications can disrupt your sleep."
“A much greater issue [than the blue light] is likely to be the content viewed,” says Peirson. “Reading work emails relating to impending deadlines is clearly going to cause anxiety, and anxiety is strongly related to insomnia.”
Someone with, for instance, older kids who could get themselves into a situation (and only communicate by text) and a parent in a different time zone who's got Alzheimer's and is being cared for by a stressed-out sibling who needs support and agreement from the rest of us by group email.
Most phones these days allow you to set a DND schedule which you can customize to allow specific numbers for emergencies and people that don't abuse it.
if this is the case, it should be in your contract, you should get paid for on-call duty and get a free SIM and/or phone for those notifications, so you can mute or shutdown notifications from your private SIM/phone
Bruh I work in IT (maintaining servers too) and my day ends at 5. You need a union. If you're on call literally all the time you should be getting paid overtime.
I don't turn off notifications. They don't affect my sleep at all, because they don't make much of a sound. And I don't get that many notifications to begin with, I could easily go a whole night without receiving any notifications