I’ve never understood why people use high/low energy contexts. For myself, what constitutes a high energy task can change from day to day. Some days I’m in the mood for creative work like mindmapping and brainstorming, and digging into financial spreadsheets can seem like heavy work. Other days Im in the mood for procedural work and creative thinking requires more brain power.
I don’t even understand how you can get an objective filter on being in a “high level” or “low level” state. It’s too black and white, I usually somewhere in the middle.
When I feel tired, I don’t even remember that I use GTD and have a menu of options to pick something from. Even when I do remember to review appropriate context lists, I don’t start to think about energy levels. I’m tired, I just naturally pick something easy from my Computer or my Home list, or just don’t give a damn and watch something from my Read/Watch list (or start scrolling RSS/Twitter/Reddit)