The half-life of caffeine is roughly six hours, meaning a coffee at noon leaves a quarter of its caffeine in your system at midnight.

A psychological phenomenon called 'prevalence induced concept change' suggests that in comfortable lives, we start to create problems and perceive non-threatening things as threatening.

Alcohol is a sedative, not a sleep aid; it fragments sleep and blocks REM sleep, which is crucial for emotional processing.

You should listen to expert advice but filter it through your own experience, as you ultimately know what's best for you better than any external expert.

Many modern physical and mental health conditions are 'diseases of comfort,' and you must intentionally introduce discomfort into your life to thrive.

Create a simple, powerful rule like 'always take the stairs' to automate uncomfortable but healthy behaviors and build psychological resilience.

Counter-intuitively, young people are now struggling with greater levels of loneliness than older people, with rates in the US being double that of those over 65.