What statistics support Ken Walker's philosophy of peace living in little habits?

Sleep: People who get 7–9 hours of sleep are about 20–60% less likely to experience depression and anxiety symptoms than short sleepers (various large cohort studies).

Movement: Even 10–15 minutes of daily walking is linked to significantly lower stress and better mood compared to being sedentary.

Mindfulness: Meta-analyses show small daily mindfulness practices can reduce anxiety and depression with effect sizes similar to some first‑line therapies.

Gratitude / journaling: Studies from positive psychology show that writing 3 good things a day for 1–2 weeks can improve happiness and reduce depressive symptoms for up to a month.