This is the title track from English R&B singer and former Floetry member Marsha Ambrosius' debut solo album. She explained the title to MTV News: "It goes with the lifestyle, it's the grind. It's late nights in the studio, it's early mornings of having to get on the Acela and get up to New York and do interviews. Late night, early mornings: it's the life of an artist, but I think everyone can relate to that." Ambrosius then conceded there is a sensual connotation to it as well, "The sensual aspect came into it when I wrote the record 'Late Nights & Early Mornings.' [I was thinking], 'Ooh, it's gonna be a late night, early morning when I get you home.'"
"Kickstart My Heart" is about all the ways Motley Crue gets their blood flowing without drugs. It was inspired by their bass player Nikki Sixx, who claimed he had to be revived with a shot of adrenaline to the heart after an overdose.