IN THE STREETS & ON THE WEB

Lol! Jay Z Wasn't Feeling His Own After Party In Vegas

Nobody was feeling Jay Z's after party in Las Vegas the way he was -- and that's a good thing ... 'cause from the looks of It Jay just wanted to be somewhere else.

Jay Z hosted, undoubtedly, the most exclusive Mayweather-Pacquiao bash at Marquee Nightclub Saturday night ... VIP tables went for $50k.

He and Beyoncé held court at their own table right on the dance floor -- but while the DJ was trying to get the crowd going, Jigga seemed to be dreaming ... of laying his head on his pillow.

Of course, his pillow was probably on a G6 ... WITH Bey ... so, can't blame the guy.