For as long as clock sync for electronic devices has been common, I have suggested to anyone who would listen that we should adjust forward 10 minutes on the first Sunday of each month for six months, and then back 10 minutes on the first Sunday of the other six months. A ten minute change once a month is not only easier to adjust to (almost unoticeable), but if you miss it, it's not as big a deal as being off by an hour would be.