It's because of Passover: The Seder (main celebratory meal) lasts till midnight and later, and it's a very big deal for children. So they don't want Daylight S

It's because of Passover: The Seder (main celebratory meal) lasts till midnight and later, and it's a very big deal for children. So they don't want Daylight Savings Time to make it end even later than it already does. It's also because of the fast day of Yom Kippur - people wanted the faster to end 1 hour earlier. So they wanted DST to match up to those days - but that made the DST period too short, and led to the negotiations.