Ma'anar ƙamus na kalmar "tafiya mai barci" shine tafiya ko yin wasu ayyuka yayin barci ko cikin yanayin barci, wanda kuma aka sani da somnambulism. Wani yanayi ne da mutum ya tashi yana yawo yana barci, sau da yawa ba ya san inda yake. Tafiya na barci na iya faruwa a kowane mataki na barci amma ya fi yawa a lokacin barci mai zurfi. Har ila yau, yana yiwuwa a yi wasu ayyuka yayin barci, kamar cin abinci, magana, ko ma tuka mota, ba tare da sanin abin da ke faruwa ba.