“Sleep tight, don’t let the bedbugs bite” is an old saying many of us grew up with. And while we thought it to be just a quaint little ditty our dads teased us with before turning off the lights, it appears bedbugs are indeed making a comeback in the U.S., and this has health officials worried. Bedbugs were common in America before World War II until the use of DDT almost entirely eradicated the tiny, brownish flat insects from our collective memory. But in the past four years, pest control officials note that reports of the insects, which feast on human blood and cause bad itching, have increased fivefold in cities ranging from New York to Honolulu, and unless measures are undertaken soon, many feel this bedbug menace could well become a nightmare.