Every year, an enormous scientific experiment is conducted, with a sample size of nothing less than 3 billion people worldwide.
All these people will collectively sleep 1 hr less for 1 night on a specific date. The experiment? Daylight saving time. The result? An almost 5% bump in suicides, work injuries, traffic accidents, heart attacks etc. That's what 1 hr less sleep for 1 night does to us. Imagine the longlasting effect.
Sleep truely is the closest to a potion for immortality we have as humans. Any damage to our body is healing 65% faster during our deepest sleeping fases then when we would've been awake. And I'm not even talking about mental effects.