Wellbeing

How to rate how sleepy you feel right now on the 9-point scale, what research shows a score above 6 means for attention and driving, and how to use it to see what drives your sleepiness.

How the 10-item PSS measures how stressful your past month felt, how it's scored from 0 to 40, why its authors say there are no cut-offs, and how to use it to follow change over time.

Why ratings made in the moment are more accurate than looking back, how to keep a simple 1 to 5 rating useful, and how to see what your days have in common.