For places that observe daylight saving time, gaining an hour of sleep every November -- or losing an hour every March -- doesn't just affect how well-rested (or caffeinated) people are. The effects of the semi-annual time change are far-reaching, drastically changing stroke and car accident rates, stock prices and more! Sleep scientist Matt Walker shares the surprising consequences of DST, and what they can teach us about improving our own sleep health.

Matt Walker: How daylight saving time affects our bodies, minds -- and world

How daylight saving time affects our bodies, minds -- and world

Spring's daylight saving time reveals a 24% spike in heart attacks, illustrating the profound impact of losing an hour of sleep.

Gaining an extra hour of sleep in autumn not only lowers heart attack rates by 21% but also reduces accidents and suicide rates.

Even the economy feels the sting of daylight saving time, with stock market returns declining following the sleep loss transition.