The book waiting by the chair can be a reason to finish one small task and sit down.

A pleasure left in plain sight changes how a chore feels. If something you are looking forward to is visible and ready, the last twenty minutes of tidying acquires a destination, and you stop instead of drifting into another job. The reward does not have to be large, but it has to be there and to require nothing of you.

Set the good thing up before you start the dull one. Put the book on the chair, the bath running, the record by the player. Then do the task with an end in mind, and take the reward when you get there rather than carrying on out of habit.