It happened again today. I lost 4% of a day of sleep due to Daylight Saving Time. We didn't have it when I was growing up in Indiana; it just meant that all our TV shows shifted in their schedules. My mom also grew up in Indiana, which now has DST, but now she lives in Arizona, which doesn't; coincidence? Nobody I know seems to like it. So why do we have Daylight Saving Time?
The usual answer given is that it saves energy. However, this seems to be BS. While it may have been true in the past, recent studies show either a net wash, or that it even uses more energy. We also hear that it's for the farmers, but I never heard any farmers in Indiana asking for it; just the opposite.
For the real reason, we have to follow the money. DST is regulated by governments, which are run by politicians, who are lobbied by special interests. The special interest paying for DST is the retail industry, which makes more money when daylight ends later. They lobbied a decade ago for DST to be extended by a month nationally in the US, with extra help from the sugar industry to include Halloween, and Indiana adopted DST at the same time.
Since the opposition to DST is not organized, it has no paid lobby, so we are stuck with it for the foreseeable future.