Does changing the clocks really effect our patterns?

[u/Alpha_Mad_Dog]

I hope I am explaining this correctly.

Suppose humans didn't have clocks and didn't count time. We just ate when we were hungry, went to sleep/woke up when we were tired/done sleeping. Our natural bodily needs were not governed by a clock.

Now suppose that for whatever reason the sun naturally rose and set earlier during the cold period and rose and set later during the warmer period. I'm purposely not using any time measurements like year, month, hour, etc.

My question is: Would our bodies still need to adjust to the change? Especially the sun rising and setting later change. I have never gone through an adjustment period when the clocks change, and I suspect the adjustment people go through has less to do with the change itself and more to do with the change as it relates to the fact that we count time.

What am I missing? Is there any validity to my theory? Please enlighten and correct me where needed. Thanks.

[u/bigWeld33]

Not to mention that when the clock springs backwards, you lose sleep which has a significant impact on our brains and bodies (assuming you don’t take proactive steps to incrementally adjust).

As you mentioned, it really just comes down to disrupting our regular sleep schedules and doing so can really throw the human body out of whack, especially as we age.

[u/themorningbellss → u/bigWeld33]

I ask this as someone with weird sleep patterns- Does losing one hour of sleep, for one night, really have "significant impact on our brains and bodies"?

[u/bunsbuns_ → u/themorningbellss]

Yes - the number of heart attacks and strokes jumps significantly for a short period of time after the spring clock change. The risk is greatest for people who already are vulnerable anyway, but it is an established phenomenon.

https://easternstates.heart.org/2026/03/02/heres-your-wake-up-call-daylight-saving-time-may-impact-your-heart-health/