Sources & Notes
All Session scripts are written and read by us. Where they draw on outside research, we've listed it here — including honest notes on what's well-established science versus what's still genuinely debated. We'd rather you trust us a little less on one point than trust us blindly on all of them.
A UCLA/USC study of 30 working couples found that people who described their homes using words like "cluttered" or "unfinished" showed flatter, less healthy daily cortisol patterns — particularly women. This doesn't prove clutter causes stress on its own, but it's a real, peer-reviewed, frequently-cited finding linking how we describe our space to measurable stress hormone patterns.
One of the most cited papers in economics and psychology, and the basis for Kahneman's 2002 Nobel Prize. The core finding — that losing something feels roughly twice as painful as an equivalent gain feels good — has been replicated globally as recently as 2019, across many countries and currencies.
Here's the honest version: the idea that willpower is a depletable resource was hugely influential, but large-scale replication attempts involving dozens of labs have largely failed to reproduce the original effect. It's now considered one of psychology's clearest replication-crisis case studies. We still think the lived experience many people describe — feeling worse at deciding after many small decisions — is real and worth naming. We just won't tell you it's settled science, because it isn't. Treat that Session as a useful framework for noticing your own patterns, not as a proven law of the brain.