My scientific work examines altered states, physiology, and human adaptation through empirical research. But scientific papers capture only part of the process. Many of the observations, questions, and ideas that eventually shape research begin elsewhere: in fieldwork, extreme environments, conversations, and lived experience. Field Notes is where I explore that layer of the work. It is a space for observations and ideas at the intersection of science and experience, including altered states, extreme physiology, human performance, adaptation, and the environments in which these processes unfold. Some entries are conceptual, some observational, and some personal. They are not intended as scientific conclusions, but as part of the broader process of asking questions, noticing patterns, and exploring ideas before, or beyond, their place in formal research. At the centre of it all is the same question: What can altered and extreme states teach us about being human?