diff --git a/asyncio_micro/asyncio_micro.py b/asyncio_micro/asyncio_micro.py
index 733e679f..c07e40a8 100644
--- a/asyncio_micro/asyncio_micro.py
+++ b/asyncio_micro/asyncio_micro.py
@@ -150,10 +150,11 @@ class SysCall:
         self.call = call
         self.args = args
 
-class Sleep(SysCall):
-
     def handle(self):
-        time.sleep(self.args[0])
+        raise NotImplementedError
+
+class Sleep(SysCall):
+    pass
 
 class IORead(SysCall):