Have you ever been distracted and taken off purpose? Distracted by other things? Those bright shiny objects.
Stuff that has low value but imposes on you. It can take over a well planned minute, hour or day. Your email list,your friends dropping by unexpectedly and on for a long chat. It could be your affectionate cat or child.
Maybe it is the easiest and least important things on your 'to-do' list that get your attention rather than the important but more difficult things.