diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TObject.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TObject.java
index cdf71e91b..366fbf6a5 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TObject.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TObject.java
@@ -267,7 +267,8 @@ public class TObject {
         monitorExit(this, monitor.count);
     }
 
-    private static class NotifyListenerImpl implements NotifyListener, TimerHandler, PlatformRunnable {
+    private static class NotifyListenerImpl implements NotifyListener, TimerHandler, PlatformRunnable,
+            TThreadInterruptHandler {
         final TObject obj;
         final AsyncCallback<Void> callback;
         final TThread currentThread = TThread.currentThread();
@@ -309,6 +310,23 @@ public class TObject {
             TThread.setCurrentThread(currentThread);
             monitorEnterWait(obj, lockCount, callback);
         }
+
+        @Override
+        public void interrupted() {
+            if (performed) {
+                return;
+            }
+            performed = true;
+            if (timerId >= 0) {
+                Platform.killSchedule(timerId);
+                timerId = -1;
+            }
+            Platform.postpone(new PlatformRunnable() {
+                @Override public void run() {
+                    callback.error(new TInterruptedException());
+                }
+            });
+        }
     }
 
     @Rename("wait")
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThread.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThread.java
index 707cc0f97..52e97cd90 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThread.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThread.java
@@ -37,8 +37,9 @@ public class TThread extends TObject implements TRunnable {
     private long timeSliceStart;
     private int yieldCount;
     private final Object finishedLock = new Object();
-    
-    
+    private boolean interruptedFlag;
+    private TThreadInterruptHandler interruptHandler;
+
     private TString name;
     TRunnable target;
 
@@ -104,20 +105,20 @@ public class TThread extends TObject implements TRunnable {
     public TString getName() {
         return name;
     }
-    
+
     public final void join(long millis, int nanos) throws InterruptedException {
         if (currentThread() == this) {
             return;
         }
-        synchronized(finishedLock) {
+        synchronized (finishedLock) {
             finishedLock.wait(millis, nanos);
         }
     }
-    
+
     public final void join(long millis) throws InterruptedException {
         join(millis, 0);
     }
-    
+
     public final void join() throws InterruptedException {
         join(0);
     }
@@ -146,14 +147,22 @@ public class TThread extends TObject implements TRunnable {
     }
 
     public void interrupt() {
+        interruptedFlag = true;
+        if (interruptHandler != null) {
+            interruptHandler.interrupted();
+            interruptHandler = null;
+        }
     }
 
     public static boolean interrupted() {
-        return false;
+        TThread thread = currentThread();
+        boolean result = thread.interruptedFlag;
+        thread.interruptedFlag = false;
+        return result;
     }
 
     public boolean isInterrupted() {
-        return false;
+        return interruptedFlag;
     }
 
     public static int activeCount() {
@@ -174,12 +183,42 @@ public class TThread extends TObject implements TRunnable {
     private static void sleep(long millis, final AsyncCallback<Void> callback) {
         final TThread current = currentThread();
         int intMillis = millis < Integer.MAX_VALUE ? (int)millis : Integer.MAX_VALUE;
-        Platform.schedule(new PlatformRunnable() {
-            @Override public void run() {
-                setCurrentThread(current);
+        SleepHandler handler = new SleepHandler(current, callback);
+        handler.scheduleId = Platform.schedule(handler, intMillis);
+        current.interruptHandler = handler;
+    }
+
+    private static class SleepHandler implements PlatformRunnable, TThreadInterruptHandler {
+        private TThread thread;
+        private AsyncCallback<Void> callback;
+        private boolean isInterrupted;
+        int scheduleId;
+
+        public SleepHandler(TThread thread, AsyncCallback<Void> callback) {
+            this.thread = thread;
+            this.callback = callback;
+        }
+
+        @Override
+        public void interrupted() {
+            thread.interruptedFlag = false;
+            isInterrupted = true;
+            Platform.killSchedule(scheduleId);
+            Platform.postpone(new PlatformRunnable() {
+                @Override public void run() {
+                    callback.error(new TInterruptedException());
+                }
+            });
+        }
+
+        @Override
+        public void run() {
+            if (!isInterrupted) {
+                thread.interruptHandler = null;
+                setCurrentThread(thread);
                 callback.complete(null);
             }
-        }, intMillis);
+        }
     }
 
     public final void setPriority(int newPriority){
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThreadInterruptHandler.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThreadInterruptHandler.java
new file mode 100644
index 000000000..57602c890
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TThreadInterruptHandler.java
@@ -0,0 +1,24 @@
+/*
+ *  Copyright 2015 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.java.lang;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public interface TThreadInterruptHandler {
+    void interrupted();
+}
diff --git a/teavm-tests/src/test/java/org/teavm/classlib/java/lang/ThreadTest.java b/teavm-tests/src/test/java/org/teavm/classlib/java/lang/ThreadTest.java
index 72e4b697c..a2b548d77 100644
--- a/teavm-tests/src/test/java/org/teavm/classlib/java/lang/ThreadTest.java
+++ b/teavm-tests/src/test/java/org/teavm/classlib/java/lang/ThreadTest.java
@@ -33,6 +33,29 @@ public class ThreadTest {
         assertTrue("Thread.sleed did not wait enogh", duration >= 100);
     }
 
+    @Test
+    public void sleepInterrupted() {
+        long start = System.currentTimeMillis();
+        final Thread mainThread = Thread.currentThread();
+        new Thread() {
+            @Override public void run() {
+                try {
+                    Thread.sleep(100);
+                } catch (InterruptedException e) {
+                }
+                mainThread.interrupt();
+            }
+        }.start();
+        try {
+            Thread.sleep(300);
+            fail("Exception expected");
+        } catch (InterruptedException e) {
+            assertEquals(Thread.currentThread(), mainThread);
+            assertFalse(mainThread.isInterrupted());
+            assertTrue(System.currentTimeMillis() - start < 150);
+        }
+    }
+
     @Test
     public void catchesAsyncException() {
         try {