Her onstage antics during her north American tour have included swigging beer, throwing back shots and writhing with female audience members - not to mention singing and dancing.
So after all that, it is understandable that Rihanna would be feeling a little sleepy.
The singer looked like she may have forgotten to change out of her nightshirt as she left her New York hotel yesterday.
Sleepy? Rihanna was pictured out in New York yesterday wearing what looked like a nightshirt
She beat the 32 Celcius (90F) New York heat by going without trousers, adding only large hoop earrings and tan brogues to the ensemble as she shopped with her entourage including best friend Melissa.
The 23-year-old seemed to have bed on the brain, posting a picture earlier of her customised 'RiRi' pillowcases provided by her hotel.
Rihanna tweeteed: 'My hotel has "RiRi" stitched into my pillowcases, how f****** Raaaddd is that??! #rockstars*** #wheretheydodatat #IheartNYC.'
At her sell-out concert in Atlantic City' Borgata Hotel & Casino & Spa the night before, Rihanna indulged in even more risque behaviour than usual in front of an audience full of young fans, including slugging alcohol, making offensive hand gestures and overtly sexual dance moves.
Bed on the brain: Rihanna tweeted a picture of her customised pillow cases in her New York hotel
The star wore an array of typically risqué outfits, including ultra short shorts and colourful cropped top and a slinky silver sequinned dress for the performance.
And in another typically outrageous dance move, she took part in a girl on girl dance with a female member of her dance troupe.
The singer is often seen indulging in some risqué dances - she once famously performed a lap dance with a female fan on stage, and gyrating on top of her.
But her risqué moves, which often extend to her music videos, have gained Rihanna some unwanted publicity.
Earlier this year, she was forced to defend her controversial new music video Man Down, insisting 'this is the real world'.
Drinking it down: Rihanna swigged from a bottle of Corona on stage in Atlantic City, New Jersey last night
Boozing and swearing: Rihanna drinks down a shot and flips the finger during the gig wearing a typically scantily clad outfit of ultra short shorts and a silver sequinned mini dress
