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The Happy Headband is an invention that was created by Chester. It is a device that creates dreams, whether good or bad.
The Happy Headband first appeared in Operation: U.T.O.P.I.A., when Nigel tried to steal it from Chester. After the headband had been used on him, Numbuh 1 believes to have escaped and landed on a utopia with the rest of Sector V only to find out it was all a dream. After waking, Nigel broke free of it and then used it on Chester, in which Sector V left him before Wallabee changed the device to make Chester have a terrible nightmare. It is used later again in Operation: W.H.I.T.E.H.O.U.S.E., when Numbuh's 74.239 and Infinity use it to test Nigel's loyality to the Kids Next Door.