Worry people are small, rather crude (but charming) dolls, usually sold in batches of several in a bag or box. As far as I know they are particular to the Maya of highland Guatemala. Children put them under their pillows at night as a sleep aid.
Tradition — or the vendors of the dolls — has it that one confesses one’s worry to the doll before putting it under the pillow. Then by morning the worry people will have taken that worry away.
The image is from dickuhne’s photostream.