diff --git a/lib/BackRest/Backup.pm b/lib/BackRest/Backup.pm
index 0224d019e..ad16cdf38 100644
--- a/lib/BackRest/Backup.pm
+++ b/lib/BackRest/Backup.pm
@@ -219,7 +219,7 @@ sub backup_thread_complete
         }
 
         # Sleep before trying again
-        sleep(.1);
+        hsleep(.1);
     }
 
     &log(DEBUG, 'all threads exited');
diff --git a/lib/BackRest/ThreadGroup.pm b/lib/BackRest/ThreadGroup.pm
index e816f5694..aba5798b2 100644
--- a/lib/BackRest/ThreadGroup.pm
+++ b/lib/BackRest/ThreadGroup.pm
@@ -8,16 +8,10 @@ use strict;
 use warnings;
 use Carp;
 
-# use Scalar::Util;
-# use Net::OpenSSH;
 use File::Basename;
-# use POSIX ':sys_wait_h';
-# use Scalar::Util 'blessed';
-#
+
 use lib dirname($0) . '/../lib';
-# use BackRest::Exception;
 use BackRest::Utility;
-# use BackRest::ProcessAsync;
 
 ####################################################################################################################################
 # CONSTRUCTOR
@@ -73,7 +67,7 @@ sub complete
     # Rejoin the threads
     while ($iThreadComplete < $self->{iThreadTotal})
     {
-        sleep(.1);
+        hsleep(.1);
 
         # If a timeout has been defined, make sure we have not been running longer than that
         if (defined($iTimeout))
diff --git a/lib/BackRest/Utility.pm b/lib/BackRest/Utility.pm
index 26ee181c4..6c6bfc767 100644
--- a/lib/BackRest/Utility.pm
+++ b/lib/BackRest/Utility.pm
@@ -10,6 +10,7 @@ use Carp qw(confess longmess);
 
 use Fcntl qw(:DEFAULT :flock);
 use File::Path qw(remove_tree);
+use Time::HiRes qw(usleep);
 use File::Basename;
 use JSON;
 
@@ -21,7 +22,7 @@ use Exporter qw(import);
 our @EXPORT = qw(version_get
                  data_hash_build trim common_prefix wait_for_file file_size_format execute
                  log log_file_set log_level_set test_set test_get test_check
-                 lock_file_create lock_file_remove
+                 lock_file_create lock_file_remove hsleep
                  ini_save ini_load timestamp_string_get timestamp_file_string_get
                  TRACE DEBUG ERROR ASSERT WARN INFO OFF true false
                  TEST TEST_ENCLOSE TEST_MANIFEST_BUILD TEST_BACKUP_RESUME TEST_BACKUP_NORESUME);
@@ -75,7 +76,7 @@ use constant
 
 # Test global variables
 my $bTest = false;
-my $iTestDelay;
+my $fTestDelay;
 
 ####################################################################################################################################
 # VERSION_GET
@@ -212,6 +213,16 @@ sub trim
     return $strBuffer;
 }
 
+####################################################################################################################################
+# hsleep - wrapper for usleep that takes seconds in fractions and returns time slept in ms
+####################################################################################################################################
+sub hsleep
+{
+    my $fSecond = shift;
+
+    return usleep($fSecond * 1000000);
+}
+
 ####################################################################################################################################
 # WAIT_FOR_FILE
 ####################################################################################################################################
@@ -237,7 +248,7 @@ sub wait_for_file
             return;
         }
 
-        sleep(1);
+        hsleep(.1);
     }
 
     confess &log(ERROR, "could not find $strDir/$strRegEx after ${iSeconds} second(s)");
@@ -359,20 +370,20 @@ sub log_file_set
 sub test_set
 {
     my $bTestParam = shift;
-    my $iTestDelayParam = shift;
+    my $fTestDelayParam = shift;
 
     # Set defaults
     $bTest = defined($bTestParam) ? $bTestParam : false;
-    $iTestDelay = defined($bTestParam) ? $iTestDelayParam : $iTestDelay;
+    $fTestDelay = defined($bTestParam) ? $fTestDelayParam : $fTestDelay;
 
     # Make sure that a delay is specified in test mode
-    if ($bTest && !defined($iTestDelay))
+    if ($bTest && !defined($fTestDelay))
     {
         confess &log(ASSERT, 'iTestDelay must be provided when bTest is true');
     }
 
     # Test delay should be between 1 and 600 seconds
-    if (!($iTestDelay >= 0 && $iTestDelay <= 600))
+    if (!($fTestDelay >= 0 && $fTestDelay <= 600))
     {
         confess &log(ERROR, 'test-delay must be between 1 and 600 seconds');
     }
@@ -498,9 +509,9 @@ sub log
         {
             *STDOUT->flush();
 
-            if ($iTestDelay > 0)
+            if ($fTestDelay > 0)
             {
-                sleep($iTestDelay);
+                hsleep($fTestDelay);
             }
         }
     }
diff --git a/test/lib/BackRestTest/BackupTest.pm b/test/lib/BackRestTest/BackupTest.pm
index aa2447f48..80dabe8b2 100755
--- a/test/lib/BackRestTest/BackupTest.pm
+++ b/test/lib/BackRestTest/BackupTest.pm
@@ -15,8 +15,8 @@ use File::Basename;
 use File::Copy 'cp';
 use File::stat;
 use Fcntl ':mode';
+use Time::HiRes qw(gettimeofday);
 use DBI;
-use Time::HiRes qw(gettimeofday usleep);
 
 use lib dirname($0) . '/../lib';
 use BackRest::Exception;
@@ -999,7 +999,7 @@ sub BackRestTestBackup_Test
 
                         if (!$oFile->exists(PATH_BACKUP_ARCHIVE, $strArchiveCheck))
                         {
-                            sleep(1);
+                            hsleep(1);
 
                             if (!$oFile->exists(PATH_BACKUP_ARCHIVE, $strArchiveCheck))
                             {
@@ -1644,7 +1644,7 @@ sub BackRestTestBackup_Test
             # Sleep .5 seconds to give a reasonable amount of time for the file to be copied after the manifest was generated
             # Sleep for a while to show there is a large window where this can happen
             &log(INFO, 'time ' . gettimeofday());
-            usleep(.5 * 1000000);
+            hsleep(.5);
             &log(INFO, 'time ' . gettimeofday());
 
             # Insert another row
@@ -1736,7 +1736,7 @@ sub BackRestTestBackup_Test
 
             # Sleep for a while to show there is a large window where this can happen
             &log(INFO, 'time ' . gettimeofday());
-            usleep(.5 * 1000000);
+            hsleep(.5);
             &log(INFO, 'time ' . gettimeofday());
 
             # Modify the test file within the same second