diff --git a/kmk/common/keycodes.py b/kmk/common/keycodes.py
index a1ecbc9..0a83005 100644
--- a/kmk/common/keycodes.py
+++ b/kmk/common/keycodes.py
@@ -40,12 +40,15 @@ class RawKeycodes:
 
     KC_UC_MODE = 1109
 
+    KC_MACRO_SLEEP_MS = 1110
+
 
 # These shouldn't have all the fancy shenanigans Keycode allows
 # such as no_press, because they modify KMK internal state in
 # ways we need to tightly control. Thus, we can get away with
 # a lighter-weight namedtuple implementation here
 LayerKeycode = namedtuple('LayerKeycode', ('code', 'layer'))
+MacroSleepKeycode = namedtuple('MacroSleepKeycode', ('code', 'ms'))
 
 
 class UnicodeModeKeycode(namedtuple('UnicodeModeKeycode', ('code', 'mode'))):
@@ -455,6 +458,10 @@ class KMK(KeycodeCategory):
     )
     KC_UC_MODE_WINC = UnicodeModeKeycode.from_mode_const(UnicodeModes.WINC)
 
+    @staticmethod
+    def KC_MACRO_SLEEP_MS(ms):
+        return MacroSleepKeycode(RawKeycodes.KC_MACRO_SLEEP_MS, ms)
+
 
 class Layers(KeycodeCategory):
     @staticmethod
diff --git a/kmk/common/macros/simple.py b/kmk/common/macros/simple.py
index 91e6680..128779b 100644
--- a/kmk/common/macros/simple.py
+++ b/kmk/common/macros/simple.py
@@ -2,13 +2,18 @@ import string
 
 from kmk.common.event_defs import (hid_report_event, keycode_down_event,
                                    keycode_up_event)
-from kmk.common.keycodes import Keycodes, char_lookup
+from kmk.common.keycodes import Keycodes, RawKeycodes, char_lookup
 from kmk.common.macros import KMKMacro
+from kmk.common.util import sleep_ms
 
 
 def simple_key_sequence(seq):
     def _simple_key_sequence(state):
         for key in seq:
+            if key.code == RawKeycodes.KC_MACRO_SLEEP_MS:
+                sleep_ms(key.ms)
+                continue
+
             if not getattr(key, 'no_press', None):
                 yield keycode_down_event(key)
                 yield hid_report_event()
diff --git a/kmk/common/util.py b/kmk/common/util.py
index 2ff06d1..e90d85b 100644
--- a/kmk/common/util.py
+++ b/kmk/common/util.py
@@ -29,3 +29,16 @@ def reset_bootloader():
         import microcontroller
         microcontroller.on_next_reset(microcontroller.RunMode.BOOTLOADER)
         microcontroller.reset()
+
+
+def sleep_ms(ms):
+    '''
+    Tries to sleep for a number of milliseconds in a cross-implementation
+    way. Will raise an ImportError if time is not available on the platform.
+    '''
+    try:
+        import time
+        time.sleep_ms(ms)
+    except AttributeError:
+        import time
+        time.sleep(ms / 1000)
diff --git a/user_keymaps/klardotsh/threethree_matrix_pyboard.py b/user_keymaps/klardotsh/threethree_matrix_pyboard.py
index 772a5c8..cb48d77 100644
--- a/user_keymaps/klardotsh/threethree_matrix_pyboard.py
+++ b/user_keymaps/klardotsh/threethree_matrix_pyboard.py
@@ -22,6 +22,8 @@ MACRO_TEST_SIMPLE = simple_key_sequence([
 
     KC.SPACE,
 
+    KC.MACRO_SLEEP_MS(500),
+
     KC.LSHIFT(KC.K),
     KC.LSHIFT(KC.M),
     KC.LSHIFT(KC.K),