diff --git a/src/tapper/controller/sleep_processor.py b/src/tapper/controller/sleep_processor.py
new file mode 100644
index 0000000..2009fc0
--- /dev/null
+++ b/src/tapper/controller/sleep_processor.py
@@ -0,0 +1,53 @@
+import time
+from typing import Callable
+
+from attr import dataclass
+from tapper.parser import common
+
+
+class StopTapperActionException(Exception):
+    """Normal way to interrupt tapper's action. Will not cause error logs etc."""
+
+
+@dataclass
+class SleepCommandProcessor:
+    """Implementation of tapper's "sleep" command."""
+
+    check_interval: float
+    """How often the check is made for whether to continue sleeping."""
+    kill_check_fn: Callable[[], bool]
+    """Checks whether action should be killed."""
+    _actual_sleep_fn: Callable[[float], None] = time.sleep
+
+    def __post_init__(self) -> None:
+        if self.check_interval <= 0:
+            raise ValueError(
+                "SleepCommandProcessor check_interval must be greater than 0."
+            )
+
+    def sleep(self, length_of_time: float | str) -> None:
+        """
+        Suspend execution for a length of time.
+        This is functionally identical to `time.sleep`, but tapper
+        has control needed to interrupt or pause this.
+
+        :param length_of_time: Either number (seconds),
+            or str seconds/millis like: "1s", "50ms".
+        """
+        self.kill_if_required()
+        started_at = time.perf_counter()
+        time_s = (
+            common.parse_sleep_time(length_of_time)
+            if isinstance(length_of_time, str)
+            else length_of_time
+        )
+        if time_s is None or time_s < 0:
+            raise ValueError(f"sleep {length_of_time} is invalid")
+        finish_time = started_at + time_s
+        while (now := time.perf_counter()) < finish_time:
+            self._actual_sleep_fn(min(self.check_interval, finish_time - now))
+            self.kill_if_required()
+
+    def kill_if_required(self) -> None:
+        if self.kill_check_fn():
+            raise StopTapperActionException
diff --git a/src/tapper/parser/common.py b/src/tapper/parser/common.py
index a63fae1..1e09fef 100644
--- a/src/tapper/parser/common.py
+++ b/src/tapper/parser/common.py
@@ -44,6 +44,15 @@ def parse_xy(coord_str: str) -> tuple[tuple[int, int], bool]:
     fn = parse_xy
 
 
+def parse_sleep_time(prop: str) -> float | None:
+    """If doesn't match sleep pattern, will return None."""
+    if SECONDS.regex.fullmatch(prop):
+        return SECONDS.fn(prop)
+    if MILLIS.regex.fullmatch(prop):
+        return MILLIS.fn(prop)
+    return None
+
+
 def split(text: str, delimiter: str) -> list[str]:
     """Split str, with minimum length of tokens same as delimiter.
 
diff --git a/src/tapper/parser/send_parser.py b/src/tapper/parser/send_parser.py
index 2c1cc14..19f630a 100644
--- a/src/tapper/parser/send_parser.py
+++ b/src/tapper/parser/send_parser.py
@@ -117,10 +117,8 @@ def resolve_chain_opening_with_props(
 
 
 def sleep_prop(prop: str) -> Optional[SleepInstruction]:
-    if common.SECONDS.regex.fullmatch(prop):
-        return SleepInstruction(common.SECONDS.fn(prop))
-    if common.MILLIS.regex.fullmatch(prop):
-        return SleepInstruction(common.MILLIS.fn(prop))
+    if (parsed := common.parse_sleep_time(prop)) is not None:
+        return SleepInstruction(parsed)
     return None
 
 
diff --git a/tests/tapper/controller/test_sleep_processor.py b/tests/tapper/controller/test_sleep_processor.py
new file mode 100644
index 0000000..208be43
--- /dev/null
+++ b/tests/tapper/controller/test_sleep_processor.py
@@ -0,0 +1,114 @@
+import time
+from dataclasses import dataclass
+from dataclasses import field
+from typing import Callable
+
+import pytest
+from tapper.controller.sleep_processor import SleepCommandProcessor
+from tapper.controller.sleep_processor import StopTapperActionException
+
+
+@dataclass
+class Counter:
+    count: int = 0
+    ticks: list[float] = field(default_factory=list)
+    result: bool = False
+    at_3: Callable[[], bool] | None = None
+
+    def tick(self) -> bool:
+        self.count += 1
+        if self.count == 3 and self.at_3 is not None:
+            return self.at_3()
+        return self.result
+
+
+class TestSleepProcessor:
+    def test_simplest(self) -> None:
+        processor = SleepCommandProcessor(
+            check_interval=1,
+            kill_check_fn=lambda: False,
+        )
+
+        time_start = time.perf_counter()
+        processor.sleep(0)
+        assert time_start == pytest.approx(time.perf_counter(), abs=0.01)
+
+    def test_immediate_kill(self) -> None:
+        counter = Counter(result=True)
+        processor = SleepCommandProcessor(check_interval=1, kill_check_fn=counter.tick)
+        with pytest.raises(StopTapperActionException):
+            processor.sleep(20)
+
+    def test_zero_time(self) -> None:
+        counter = Counter()
+        processor = SleepCommandProcessor(
+            check_interval=1,
+            kill_check_fn=counter.tick,
+        )
+        processor.sleep(0)
+        assert counter.count == 1
+
+    def test_negative_time(self) -> None:
+        processor = SleepCommandProcessor(
+            check_interval=1,
+            kill_check_fn=lambda: False,
+        )
+        with pytest.raises(ValueError):
+            processor.sleep(-1)
+
+    def test_correct_time_and_number_of_checks(self) -> None:
+        counter = Counter()
+        processor = SleepCommandProcessor(
+            check_interval=0.05,
+            kill_check_fn=counter.tick,
+        )
+
+        time_start = time.perf_counter()
+        processor.sleep(0.1)
+        assert counter.count == 3  # 1 check at the start and 2 intervals
+        assert time_start + 0.1 == pytest.approx(time.perf_counter(), abs=0.01)
+
+    def test_check_interval_bigger_than_sleep_time(self) -> None:
+        counter = Counter()
+        processor = SleepCommandProcessor(
+            check_interval=1,
+            kill_check_fn=counter.tick,
+        )
+
+        time_start = time.perf_counter()
+        processor.sleep(0.02)
+        assert counter.count == 2
+        assert time_start + 0.02 == pytest.approx(time.perf_counter(), abs=0.01)
+
+    def test_time_str_seconds(self) -> None:
+        processor = SleepCommandProcessor(
+            check_interval=0.01,
+            kill_check_fn=lambda: False,
+        )
+
+        time_start = time.perf_counter()
+        processor.sleep("0.02s")
+        assert time_start + 0.02 == pytest.approx(time.perf_counter(), abs=0.01)
+
+    def test_time_str_millis(self) -> None:
+        processor = SleepCommandProcessor(
+            check_interval=0.01,
+            kill_check_fn=lambda: False,
+        )
+
+        time_start = time.perf_counter()
+        processor.sleep("20ms")
+        assert time_start + 0.02 == pytest.approx(time.perf_counter(), abs=0.01)
+
+    def test_killed_after_3_interval(self) -> None:
+        counter = Counter(at_3=lambda: True)
+        processor = SleepCommandProcessor(
+            check_interval=0.01,
+            kill_check_fn=counter.tick,
+        )
+
+        time_start = time.perf_counter()
+        with pytest.raises(StopTapperActionException):
+            processor.sleep(1)
+        assert counter.count == 3  # 1 initial and 2 sleeps
+        assert time_start + 0.02 == pytest.approx(time.perf_counter(), abs=0.01)