Sun Time & Clock Time

I do not understand what really happens when DST starts every spring. Can you help me know what is going on in the brain?

I explained this to my boys as “Sun time” & Clock time.” Think of Standard Time as Sun time. When Daylight Saving Time starts, the sun still sets at the same time it did during Standard Time—the difference is that in the spring the Clock time is put forward one hour. We say we lose an hour when ‘we spring forward.’ In the fall, we gain back that hour when we ‘fall back,’ and Clock time again matches Sun time. The brain’s circadian rhythm clock continues to follow the sun. Our life-style changes as we start following Clock time, but the brain wants to continue following Sun time. Depending on the brain, it can take several days for it to adjust to work, school, and other activities now following Clock time. My brain’s opinion is that it would be easier to always follow Sun time OR Clock time, so we didn’t have to feel disrupted as the brain tries to adjust to life running on Clock time for about six months.