(German, sorry) Since communication yt channel which sums up the facts quite good:

- Sleep: https://www.youtube.com/watch?v=LprmzAzarRU
- DST: https://www.youtube.com/watch?v=WwmQ6RhWk7g

But here is a view things (Sleep):

- we don't have a fixed inner clock, but a cyclic one which can be adjusted "early birds" have a cycle <24h and "late owls" a cycle >24h (this means that only the abrupt change is fundamentally bad)

- society is biased to benefit "early birds"

- but in current society more then half of all people are "late owls"

- using a alarm to forcefully wake you up has negative effects even if you got enough sleep

- the amount of sleep you need is independent of weather you are an early bird or late owl

- forcing owls to stand up early causes sleep deprivation

- you can manipulate your inner clock through light exposure, food and sport.

- the best light to affect you is the natural sun, going out (Added by me from context:in the morning) can be especially useful

- How your long your inner cycle is depends on your age, this effect seems to be biologically based and appear in all people around the world

- Sleep scientist try to convince (middle) schools to start at 9am instead of 8am because of the previous point.

And for DST:

- 80% of people in a EU questionnaires "voted" in favor of the removal of DST

- more people wanted to keep summer time then winter time

- But this should be decided based on since as this has major biological effects on the body

- In Germany "common time" is winter time, summer time was set as sun rises earlier in summer. (Me: No idea if that's the case in the US to or if it's the other way around, people in Germany also use the terms summer and winter time so "common time" isn't really a thing anymore)

- Recap of previous points ("early birds"/"late owls"), (btw. the terms where freely translated by me, in Germany they use Lark and Owl as terms, Lark is known as the "early bird")

- Explanation of Yet Lack and why it can a bit of time to fix it. (The inner clock is a "strong oscillator")

- More details of how the clock self calibrates itself.

- The differences in the inner clock are often just a view minutes but due to how it synchronizes with the day the actual differences are larger

- Just the sunlight rising difference in the same time zone can lead to noticeable differences in when people "naturally" stand up.

- There is a social yet lag (your inner clock being out of sync with society)

- Having sleep deprivation (e.g. because of social yet lack) is correlating with all kind of problems from reduced mental capacity/abilities over mode swings to overweight.

- Permanent summer time would make it worse for people already being affected by social yet lack (i.e. late owls).

- Because of this the scientific consensus is that (most?) scientist in that field warn that permanent summer time would be a very bad idea for health reason.

- Me: Interestingly I did observe that late owls tend to more likely to have strong opinions about permanent summer time even through this would be biologically bad for them.

- Most people are neither "early birds" nor "late owls" but somewhere in between, there are more people edging in the direction of late owls.

- Hardly anyone (<2%) has a negative social yet lack (most likely through indirect effects). While much more have a positive social yet lack, i.e. stand up earlier then they should. Which is way to reason why permanent summer time would be generally bad for society due to negative biological effects on many people.

- How bad permanent summer time is for people in general isn't clear, but we know it is bad.

- The negative effects are tricky to measure as they appear long time.

- We should get away from ideas like "the early bird catches the worm" or starting schools at 8am.

- Due to the potential serve (accumulated) consequences of choosing the wrong time (i.e. permanent summer time) the decision should be based on scientific analysis not of opinions about how people feel about it.