diff --git a/ag.cc b/ag.cc
index ed6a630..87cd4ad 100644
--- a/ag.cc
+++ b/ag.cc
@@ -3,6 +3,7 @@
 #include "ag.h"
 #include "Video.h"
 #include "wfobj/WFObj.hh"
+#include <unistd.h>                 /* usleep() */
 #include <lua.hpp>
 #include <iostream>
 #include <string>
@@ -18,6 +19,7 @@ namespace ag
             { "loadModel", loadModel },
             { "videoStart", videoStart },
             { "videoStop", videoStop },
+            { "sleep", sleep },
             { NULL, NULL }
         };
         luaL_register(L, "ag", functions);
@@ -115,10 +117,28 @@ namespace ag
     int videoStart(lua_State * L)
     {
         g_video->start();
+        return 0;
     }
 
     int videoStop(lua_State * L)
     {
         g_video->stop();
+        return 0;
+    }
+
+    int sleep(lua_State * L)
+    {
+        int argc = lua_gettop(L);
+
+        if (argc == 1)
+        {
+            if (lua_type(L, -1) == LUA_TNUMBER)
+            {
+                double seconds = lua_tonumber(L, -1);
+                usleep((useconds_t) (seconds * 1000000));
+            }
+        }
+
+        return 0;
     }
 }
diff --git a/ag.h b/ag.h
index 757c2f2..5d94c7f 100644
--- a/ag.h
+++ b/ag.h
@@ -12,6 +12,7 @@ namespace ag
     int loadModel(lua_State * L);
     int videoStart(lua_State * L);
     int videoStop(lua_State * L);
+    int sleep(lua_State * L);
 }
 
 #endif