diff --git a/CHANGED b/CHANGED
index 9f8508f0b..88ef72f6c 100644
--- a/CHANGED
+++ b/CHANGED
@@ -20,6 +20,7 @@
   - feature: FHEMWEB console (== inform timer)
   - feature: remove dependency on Google::Weather, major rewrite (Boris)
   - feature: started experimental interface implementation (fhem API v2) (Boris)
+  - feature: sleep issued in at/notify/etc is not blocking fhem anymore
 
 
 - 2011-12-31 (5.2)
diff --git a/docs/commandref.html b/docs/commandref.html
index ef28fe532..6f4b0acca 100644
--- a/docs/commandref.html
+++ b/docs/commandref.html
@@ -1020,12 +1020,11 @@ A line ending with \ will be concatenated with the next one, so long lines
   Example:
   <ul>
     <code>sleep 0.5</code><br>
-    <code>notify btn3 set lamp toggle;;sleep 0.5;;set lamp toggle</code>
+    <code>define n3 notify btn3.* set lamp toggle;;sleep 0.5;;set lamp toggle</code>
   </ul>
   <br>
-  Note: As the server is <b>not</b> multithreaded, everything is blocked for
-  the given amount.<br>
-
+  Note: sleep followed by another command and issued in at/notify/etc is not
+  blocking fhem.<br>
 </ul>
 
 
diff --git a/fhem.pl b/fhem.pl
index 110c65c53..513374153 100755
--- a/fhem.pl
+++ b/fhem.pl
@@ -183,6 +183,7 @@ my $namedef =
   "- a range seperated by dash (-)\n";
 my $stt_sec;                    # Used by SecondsTillTomorrow()
 my $stt_day;                    # Used by SecondsTillTomorrow()
+my @cmdList;                    # Remaining commands in a chain. Used by sleep
 
 $init_done = 0;
 
@@ -683,7 +684,8 @@ AnalyzeCommandChain($$)
   $cmd =~ s/#.*$//s;
 
   $cmd =~ s/;;/SeMiCoLoN/g;
-  foreach my $subcmd (split(";", $cmd)) {
+  @cmdList = split(";", $cmd);
+  while(my $subcmd = shift @cmdList) {
     $subcmd =~ s/SeMiCoLoN/;/g;
     my $lret = AnalyzeCommand($c, $subcmd);
     push(@ret, $lret) if(defined($lret));
@@ -725,7 +727,6 @@ AnalyzeCommand($$)
   $cmd =~ s/^(\\\n|[ \t])*//;# Strip space or \\n at the begginning
   $cmd =~ s/[ \t]*$//;
 
-
   Log 5, "Cmd: >$cmd<";
   return undef if(!$cmd);
 
@@ -1929,10 +1930,26 @@ CommandSleep($$)
 
   return "Cannot interpret $param as seconds" if($param !~ m/^[0-9\.]+$/);
   Log 4, "sleeping for $param";
-  select(undef, undef, undef, $param);
+
+  if(!$cl && @cmdList && $param && $init_done) {
+    InternalTimer(gettimeofday()+$param, "WakeUpFn", join(";;", @cmdList), 0);
+    @cmdList=();
+
+  } else {
+    select(undef, undef, undef, $param);
+
+  }
   return undef;
 }
 
+sub
+WakeUpFn($)
+{
+  my $param = shift;
+  my $ret = AnalyzeCommandChain(undef, $param);
+  Log 2, "After sleep: $ret" if($ret);
+}
+
 
 #####################################
 # Return the time to the next event (or undef if there is none)