The GrAIg mobile app also collects daily subjective data. Simply go to the Daily Questionnaire tab and answer the 5 questions.
You will receive a notification at 8 am each day to remind you to fill it in, it will only take you 15 seconds a day.
While it may seem tiring to fill out every day, this information plays an important role in the validity of our estimations as they not only rely on physiological data but also psychological data.
Good to know: This questionnaire is the one proposed by Hooper et al. in 1995.