diff --git a/src/body/Body.js b/src/body/Body.js
index c46a5a7..a8a8f2b 100644
--- a/src/body/Body.js
+++ b/src/body/Body.js
@@ -113,19 +113,30 @@ var Body = {};
      * Description
      * @method resetForcesAll
      * @param {body[]} bodies
-     * @param {vector} gravity
      */
-    Body.resetForcesAll = function(bodies, gravity) {
+    Body.resetForcesAll = function(bodies) {
         for (var i = 0; i < bodies.length; i++) {
             var body = bodies[i];
 
-            if (body.isStatic || body.isSleeping)
-                continue;
-
             // reset force buffers
             body.force.x = 0;
             body.force.y = 0;
             body.torque = 0;
+        }
+    };
+
+    /**
+     * Description
+     * @method applyGravityAll
+     * @param {body[]} bodies
+     * @param {vector} gravity
+     */
+    Body.applyGravityAll = function(bodies, gravity) {
+        for (var i = 0; i < bodies.length; i++) {
+            var body = bodies[i];
+
+            if (body.isStatic || body.isSleeping)
+                continue;
 
             // apply gravity
             body.force.y += body.mass * gravity.y * 0.001;
diff --git a/src/core/Engine.js b/src/core/Engine.js
index e17c0b2..5a308a4 100644
--- a/src/core/Engine.js
+++ b/src/core/Engine.js
@@ -169,7 +169,13 @@ var Engine = {};
 
         Metrics.reset(engine.metrics);
 
+        if (engine.enableSleeping)
+            Sleeping.update(world.bodies);
+
+        Body.applyGravityAll(world.bodies, world.gravity);
+
         MouseConstraint.update(engine.mouseConstraint, world.bodies, engine.input);
+        
         Body.updateAll(world.bodies, delta * engine.timeScale, correction, world.bounds);
 
         // update all constraints
@@ -226,13 +232,10 @@ var Engine = {};
         }
         Resolver.postSolvePosition(world.bodies);
 
-        if (engine.enableSleeping)
-            Sleeping.update(world.bodies);
-
         Metrics.update(engine.metrics, engine);
 
         // clear force buffers
-        Body.resetForcesAll(world.bodies, world.gravity);
+        Body.resetForcesAll(world.bodies);
 
         return engine;
     };
diff --git a/src/core/Sleeping.js b/src/core/Sleeping.js
index 5ba54e7..da359b2 100644
--- a/src/core/Sleeping.js
+++ b/src/core/Sleeping.js
@@ -23,6 +23,12 @@ var Sleeping = {};
             var body = bodies[i],
                 motion = body.speed * body.speed + body.angularSpeed * body.angularSpeed;
 
+            // wake up bodies if they have a force applied
+            if (body.force.x > 0 || body.force.y > 0) {
+                Sleeping.set(body, false);
+                continue;
+            }
+
             var minMotion = Math.min(body.motion, motion),
                 maxMotion = Math.max(body.motion, motion);