When I was a kid, every clock in the house would have to be readjusted for Daylight Saving time. I'd often go quickly around the house and update all the clocks.
In 1996, Windows 95 prompted me to change the clock - wow, something that (more or less) changed itself!
This year, on the other hand, my alarm clock and computer both switched themselves - silently! So I woke up and thought I'd only slept in until 6:30 am. I had to be reminded by other people that I'd had an extra hour of sleep.
Some day I could imagine not even knowing that the time had switched, I just sleep in one day too long or too short.