I don’t know why, but the statistics of this blog says that there are lots lof people who have interest in sleep function in Cocoa. Probably a same guy keeps visiting my blog for this.
Well, I don’t know what is so special about sleep.
Mac OS X is UNIX. So, you can use any standard library functions like sleep(), usleep() and nanosleep(). Also, NSThread provides Cocoa-level sleep facility.