DISRUPTION SHOWING HOW VULNERABLE THE SYSTEM IS LIZ KREUTZ, NBC NEWS >>> GET READY TO CHANGE YOUR CLOCKS IT IS DAYLIGHT SAVINGS TIME. WE ARE ARE SPRINGING FORWARD THIS WEEKEND AS WE SAY SOME EXPERTS SAY THIS SHIFT IS BAD FOR YOUR SLEEP AND EARLIER THIS MONTH, TH STATE OF OREGON TRIED TO GET RID OF IT ENTIRELY ZINHLE ESSAMUAH EXPLAINS ITS HISTORY AND CONTROVERSY IN THI INSTALLMENT OF SIMPLY EXPLAINE DAYILATE SIVING TIME >> Reporter: DAYLIGHT-SAVING TIME IS USED TO MAXIMIZE DAYLIGHT AT LEAST SEVEN COUNTRIES AND TERRITORIES OBSERVE THE PRACTICE WHICH TIPLY HAPPENS TWICE A YEAR IN MARCH AND NOVEMBER. >> WHY IS IT AN IMPORTAN PRACTICE >> THE GOAL OF DAYLIGHT-SAVING TIME IS TO MOVE THE HOURS OF HUMAN ACTIVITY TO MAKE THE BES USE OF DAYLIGHT. >> Reporter: IT RESETS YOU CLOCK WITH THE GOAL OF GETTING YOU MORE SUN AT LEAST HALF THE YEAR QUICK HISTORY LESSON, FOUNDING FATHER BENJAMIN FRANKLIN ALLUDED TO THIS 1784 LETTER BUT THER ARE CONFUSING THERIES ON WHO STARTED IT IT WAS ADOPTED BY GREAT BRITAI IN WORLD WAR ONE THE U.S. PASSED THE LAW IN 196 TO CONSERVE ENERGY AT LEAST 63% OF AMERICANS WANT TO TURN BACK THE CLOCKS. SEEMAICOSIA IS A FELLY AT TH AMERICAN ACADEMY OF SLEE MEDICINE THE AASM CALLED FOR THE U.S. T ELIMINATE DAYILATE SAVIN ENTIRELY, CITING DISTINC BENEFITS OF STANDARD TIME FO HEALTH AND SAFETY. >> AFTER WE HAVE LOST THAT HOUR, THAT MONDAY AFTERWARDS, THERE IS A HIGHER INSTANCE OF MOTOR VEHICLE COLLISIONS, MEDICA ERRORS >> Reporter: EXPERT DAVID PRER ACKNOWLEDGES THE DATA BUT TH PRACTICE GOES BEYOND STATISTICS. >> WHY DO YOU THINK DAYLIGHT SAVING IS LOSING SOME OF ITS POPULARITY >> I THINK THE EMPHASIS HAS BEEN IN THE WRONG PLACE NO ONE LIKES TO LOSE AN HOUR O SLEEP. BUT PEOPLE DON'T THINK OF WHY WE ARE DOING IT, WHAT IS TH BENEFIT OF IT. IF YOU KEPT IT YOUR ROUND, YOU WOULD HAVE VERY DARK MORNING ALL WINTER >> Reporter: EARLIER THIS YEAR THE OREGON LEGISLATURE ATTEMPTED TO END IT IN THE STATE HAWAII AND ARIZONA HAVE NEVE PARTICIPATED IN THE PRACTICE >> PEOPLE SHOULDN'T FOCUS ON THE LOSS OF THAT HOUR FROM ONE DAY BUT THEY HAVE TO THINK OF TH BENEFIT. >> Reporter: FOR NOW, TH CONTROVERSY AND THE CLOCKS KEE TICKING. THIS SPRING FORWARD IS MARCH