# sleep(for:) Suspends the current task for `duration`, driven by this event loop. ``` func sleep(for duration: Duration) async ``` ## Parameters `duration` How long to suspend. Negative or zero durations return on the next loop iteration. ## Discussion Unlike `Task.sleep(for:)`, which goes through the global Swift concurrency clock, this routes the wait through libevent’s timer wheel — useful when you want sleeps to share scheduling with the same multiplexer that’s driving your I/O. Internally registers a one-shot timer via [`schedule(after:_:)`](/documentation/Event/EventLoop/schedule(after:_:)) and drives the loop until it fires.