I heard this song in the mall the other day.. couldn't really work out the lyrics because it was too noisy..
But the lyrics keeps on repeating
"I am alright..baby..all night long"

It sounds like something from the 80s or early 90s
It's sung by a male singer
And it's R&B/soul (has a rather sad mood)

Does anyone know what song this might be?

I could be way off, but maybe it's "Lionel Richie - All night Long"
This is the song on youtube: http://www.youtube.com/watch?v=OyQVjGdJ60g
Male singer repeating all night long... I immediately thought of this guy haha

It's mood isn't too sad though, it might not be the one ):