Mom’s Soothing Sam Smith Lullaby Rocks Baby Back to Sleep

— -- “Rock-a-Bye Baby” has nothing on this lullaby.

Kimberly Henderson, of Sumter, South Carolina, has managed to find the perfectly pitched way to rock her baby back to sleep -- and now the rest of the world may just fall into a deep slumber, too.

A video of the soothing songstress singing Sam Smith’s version of Whitney Houston’s 80s classic, “How Will I Know,” to her 1-year-old daughter, Vaida, is going viral with nearly 5 million views on Facebook in less than 24 hours.

“I woke up this morning and I was just in awe,” Henderson, 26, told ABC News. “I don’t even know where to start. I uploaded it to Facebook and everybody just started sharing the crap out of it. And then the radio station in Seattle uploaded it and it’s gotten like 4 million views.”

Henderson’s sister shot the late-night serenade session on her cracked iPhone the week of Thanksgiving, and a radio station in Seattle shared it on its Facebook page Thursday night -- causing the video to spread across social media.

When she woke up this morning, Henderson had no idea she had turned into a viral superstar overnight.

“I didn't even think the video was that good,” she explained. “I was hesitant on even posting it because I look so awful, but my sister was like, ‘Nobody will care what you look like because everyone’s listening to your voice.'”

It turns out her sister was right.