It's important to take frequent breaks during your revision session. The brain is a muscle (not factually correct) that gets tired like any other muscles (do hearts get tired?). In order for a break to be effective, you must fully remove yourself from your working mindset. Dig a hole in the garden or annoy your sister a bit. Just keep the line between work and play clearly defined.
Overall, 'Oliver Twist for Kids' was another resounding success for Playing with Plays, and it fulfilled its purpose of creating plays from 'tricky' classics that were enjoyable and accessible for kids to perform, allowing them to enjoy the literature that adults are often guilty of thinking too advanced for them.