Being organized requires a balance of three limited resources. The first two are time and space. Much has been written about how to work within the limits of time and space, but there is a third resource that attracts less attention. That resource is energy. It is possible to clear your space, organize your time, and establish sensible systems for both and still not be able to stay organized, because you lack the energy to maintain those systems.
Being truly organized requires a balance of three limited resources: space, time, and energy. The first two are pretty obvious, but "energy" is often overlooked. You may be working in a comfortable, productive space and you may have what seems like a well planned out schedule, but if you haven't budgeted for your energy levels, it can all come unravelled.