i call this “the fog”  this is how my inattentive type adhd manifests i try to do something i have to do like work or a chore and this fog descends i can’t concentrate i get sleepy i struggle to focus on the task   but if i “give up” and go to reddit a personal project or even try and take a nap it’s like someone handed me a gallon of coffee and a red bull i could go all day but if i go back to what i’m supposed to be working on the fog descends again meds help a little   i consider this my most prevalent and frustrating symptom of my adhd