It is a simple thing where the time is just fast forwarded by 1 hour. So if it was 2am now, it just suddenly becomes 3am and suddenly you are sleeping one hour less.
This phenomenon called Day Light Saving or DST for short, is the convention of advancing clocks so that afternoons have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn. Adding daylight to afternoons benefits retailing, sports, and other activities that exploit sunlight after working hours, but causes problems for farming, entertainment and other occupations tied to the sun. Traffic fatalities are reduced when there is extra afternoon daylight. It is also supposed to save street lighting power.
Well at least DST means that Spring is officially here. No more snow please!
