What a Waste of Time

When I finished work today, and before I started work today, I indulged in this 'think trip'. I tried to figure out this idea for the 'perfect battery charging system' for a smartphone.   I know smartphones are a huge distraction for people, and its better not to have one -if you can.  So why do I have this fascination? - its wasted many hours of my time today and for the last few days.  Its not as if it will have any results in this world outside my mind. I think it's the color in smartphones that fascinates. If I give the thing any more 'thinking time' tomorrow I will, ....I don't know, kick myself or something.