First recorded by Guinn Family (1986).
Hit version by Vanessa Williams (US #8/R&B #1/UK #74 1989).
From the wiki: “‘Dreamin” is a song written by Lisa Montgomery and Geneva Paschal and originally performed by the family group Guinn in 1986. In 1988, Vanessa Williams recorded the song and released it as the lead single from her debut album, The Right Stuff. ‘Dreamin” became her first #1 R&B hit and her first song to chart Top 40.”
Vanessa Williams, “Dreamin'” (1989):