Critical reception Craig Lytle from
AllMusic wrote that "with a
Sly Stone twist,
Babyface concocts a laid-back funk groove for "Sittin' up in My Room," which features the humble vocals of Brandy. Though the song does not allow her to unwind with her higher notes, it does, however, reveal her lower octaves."
Larry Flick from
Billboard magazine felt it "places endlessly charming ingenue Brandy at the center of a wickedly infectious pop/funk confection." He added, "The chorus is instantly memorable and a perfect match for Brandy's unaffected, soulful style." In 2014,
Complex magazine ranked the single 39th on its list of the
50 R&B Songs of the 1990s. Cheo Hodari Coker from the
Los Angeles Times praised Babyface for his production on the song, stating "Babyface's funky-but-restrained background track is the real star of this jam. Using a pleasant mixture of plunking bass and synthesizer chords, [the song] proves that he has a grabbag of styles at his disposal." British magazine
Music Week gave it a score of four out of five, calling it "the one that could finally break Brandy into the big time. Funky." Alan Jones added, "A soft
swing shuffle with a delightful hook, it is the sort of confection that eats the opposition in the American R&B chart, and should do pretty well here, too." David Sinclair from
The Times viewed "Sittin' Up in My Room" as "a quietly smouldering slice of swingbeat-funk performed with a firm, sensual touch." He also remarked that "she sings in a deep, velvety voice that would have most men fumbling for their key-pads there and then."
Commercial performance Released as the second single from the soundtrack, "Sittin' Up in My Room" debuted at number forty-six and number thirteen, on the US
Billboard Hot 100 Singles chart and Hot R&B Singles chart, the issue date of December 30, 1995, respectively. The single reached the number two on the Hot R&B Singles chart, the issue of February 17, 1996, and stayed there three consecutive weeks. It also peaked at number two on the Hot 100 Singles chart, staying on the chart for a total of thirty-three weeks, being her longest charting song on the chart. "Sittin' Up in My Room" earned a
platinum award by the
Recording Industry Association of America (RIAA) on May 23, 1996, with 1,000,000 copies sold. ==Music video==