I have this problem where I want to listen to an audiobook, read an article and also reply to email. I end up not internalizing any information and doing absolutely nothing of any value. The audio plays without me actually listening to what is being said. The article gets skimmed and nothing of value gets retained, and my email replies end up only half-formed and full of typos.
I have to consciously work on tasks one at a time. Thinking I can work on multiple items at once is a lie I tell myself all too often.