You slept very badly last night and, as a consequence, your attention span (or patience) will be shorter today. It can help if the content you’re reading is structured in a simple layout, using plain language. Or, say, you’re suffering from an ear infection and you aren’t hearing quite as well as you usually do. Subtitles for video conferencing could make your work easier. These are just a few examples of how all of us change over time — sometimes subtly and sometimes in more significant ways — and our needs are never the same.