sleep sleep package:unix

sleep :: Int -> IO Int
unix System.Posix.Unistd
Warning: This function has several shortcomings (see documentation). Please consider using Control.Concurrent.threadDelay instead.
nanosleep :: Integer -> IO ()
unix System.Posix.Unistd
Sleep for the specified duration (in nanoseconds) GHC Note: the comment for usleep also applies here.
usleep :: Int -> IO ()
unix System.Posix.Unistd
Sleep for the specified duration (in microseconds). GHC Note: threadDelay is a better choice. Without the -threaded option, usleep will block all other user threads. Even with the -threaded option, usleep requires a full OS thread to itself. threadDelay has neither of these shortcomings.