I think our brains have gotten so dopamine-wired that our attention span has suffered. I am reading Digital Minimalism which touches on this a bit, but I'd be interested to know if there are any rigorous studies relating to this topic.
I can feel my brain being caught in a fog as my attention span has dropped drastically due to the over-stimulation. I'm going to start leaving my phone at home a few days a week and meditate in the mornings to improve on myself.