diff --git a/canvas/machine-wasm/.gitignore b/canvas/machine-wasm/.gitignore
index 4e301317..5a945b7a 100644
--- a/canvas/machine-wasm/.gitignore
+++ b/canvas/machine-wasm/.gitignore
@@ -4,3 +4,4 @@ Cargo.lock
 bin/
 pkg/
 wasm-pack.log
+pkg-release
\ No newline at end of file
diff --git a/canvas/machine-wasm/src/controller/mod.rs b/canvas/machine-wasm/src/controller/mod.rs
index 78743945..e1d6b05b 100644
--- a/canvas/machine-wasm/src/controller/mod.rs
+++ b/canvas/machine-wasm/src/controller/mod.rs
@@ -272,6 +272,10 @@ impl Controller {
         m.mem.write(address, &data);
         Ok(true.into())
     }
+
+    pub fn wake(&mut self, machine_id: u16) {
+        self.canvas.seq.wake(machine_id);
+    }
 }
 
 #[cfg(test)]
diff --git a/canvas/src/engine/effects.ts b/canvas/src/engine/effects.ts
index d881a21a..75cff75a 100644
--- a/canvas/src/engine/effects.ts
+++ b/canvas/src/engine/effects.ts
@@ -2,6 +2,7 @@ import { Effect } from "machine-wasm"
 
 import { processSynthEffect } from "@/services/audio"
 import { processMidiEvent } from "@/services/midi"
+import { processSleepEffect } from "@/services/sleep"
 
 export function processEffects(effects: Effect[], block: number) {
   for (const effect of effects) {
@@ -13,7 +14,7 @@ export function processEffects(effects: Effect[], block: number) {
         processSynthEffect(block, effect)
         break
       case "Sleep":
-        console.log("[SLEEP]", effect.duration)
+        processSleepEffect(block, effect)
         break
       default:
         console.warn("unknown effect:", effect)
diff --git a/canvas/src/services/sleep.ts b/canvas/src/services/sleep.ts
new file mode 100644
index 00000000..3d96b031
--- /dev/null
+++ b/canvas/src/services/sleep.ts
@@ -0,0 +1,20 @@
+import { Effect } from "machine-wasm"
+
+import { engine } from "@/engine"
+
+export function processSleepEffect(id: number, effect: Effect) {
+  if (effect.type !== "Sleep") return
+
+  const { duration } = effect
+
+  if (duration.type === "Tick") {
+    // tick sleep logic - count n ticks before sleep?
+  }
+
+  if (duration.type === "Ms") {
+    // ms sleep logic
+    setTimeout(() => {
+      engine.ctx.wake(id)
+    }, duration.value)
+  }
+}
diff --git a/machine/src/canvas/event.rs b/machine/src/canvas/event.rs
index cab3b8a6..8b7d7146 100644
--- a/machine/src/canvas/event.rs
+++ b/machine/src/canvas/event.rs
@@ -4,6 +4,14 @@ use tsify::Tsify;
 use crate::audio::midi::{MidiOutputFormat};
 use crate::audio::synth::SynthTrigger;
 
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Tsify)]
+#[serde(tag = "type", content = "value")]
+#[tsify(into_wasm_abi, from_wasm_abi, namespace)]
+pub enum SleepDuration {
+    Ms(u16),
+    Tick(u16),
+}
+
 /// Events that can be sent by blocks and machines.
 /// This event can be considered a side effect that will be executed by the host.
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Tsify)]
@@ -34,11 +42,3 @@ pub enum Event {
     },
 }
 
-#[derive(Tsify, Debug, Serialize, Deserialize, PartialEq, Clone)]
-#[serde(tag = "type", rename_all = "camelCase")]
-#[tsify(into_wasm_abi, from_wasm_abi, namespace)]
-pub enum SleepDuration {
-    Ms(u16),
-    Tick(u16),
-}
-
diff --git a/machine/src/machine/execute.rs b/machine/src/machine/execute.rs
index c83763a8..c930907f 100644
--- a/machine/src/machine/execute.rs
+++ b/machine/src/machine/execute.rs
@@ -246,8 +246,15 @@ impl Execute for Machine {
             Op::RightShift => s.apply_two(|a, b| Ok(a >> b))?,
 
             // Pause the execution of the thread
-            Op::Sleep(tick) => self.events.push(Event::Sleep {duration: SleepDuration::Tick(tick)}),
-            Op::SleepMs(ms) => self.events.push(Event::Sleep {duration: SleepDuration::Ms(ms)}),
+            Op::Sleep(tick) => {
+                self.sleeping = true;
+                self.events.push(Event::Sleep {duration: SleepDuration::Tick(tick)})
+            },
+
+            Op::SleepMs(ms) => {
+                self.sleeping = true;
+                self.events.push(Event::Sleep {duration: SleepDuration::Ms(ms)})
+            },
         };
 
         // Advance or jump the program counter.
diff --git a/machine/src/machine/mod.rs b/machine/src/machine/mod.rs
index 6a01dc06..cb54f06d 100644
--- a/machine/src/machine/mod.rs
+++ b/machine/src/machine/mod.rs
@@ -41,6 +41,9 @@ pub struct Machine {
 
     /// How many messages does the machine expect to receive?
     pub expected_receives: u16,
+
+    /// Is the machine sleeping?
+    pub sleeping: bool,
 }
 
 impl Machine {
@@ -57,6 +60,7 @@ impl Machine {
             outbox: vec![],
 
             is_debug: false,
+            sleeping: false,
             expected_receives: 0,
         }
     }
@@ -90,6 +94,7 @@ impl Machine {
         self.reg.reset();
         self.mem.reset_stacks();
         self.expected_receives = 0;
+        self.sleeping = false;
     }
 }
 
diff --git a/machine/src/sequencer/mod.rs b/machine/src/sequencer/mod.rs
index c926a2ef..114c10b2 100644
--- a/machine/src/sequencer/mod.rs
+++ b/machine/src/sequencer/mod.rs
@@ -10,7 +10,7 @@ use status::MachineStatus::{Awaiting, Halted, Running};
 
 pub use seq_error::SequencerError::*;
 pub use seq_error::SequencerError;
-use crate::status::MachineStatus::{Errored, Invalid, Loaded, Ready};
+use crate::status::MachineStatus::{Errored, Invalid, Loaded, Ready, Sleeping};
 
 type Errorable = Result<(), SequencerError>;
 type Statuses = HashMap<u16, MachineStatus>;
@@ -106,7 +106,7 @@ impl Sequencer {
 
             // Manage state transitions of the machine.
             match status {
-                Halted | Invalid | Loaded | Errored => continue,
+                Halted | Invalid | Loaded | Sleeping | Errored => continue,
                 Ready => { self.statuses.insert(id, Running); }
                 _ => {}
             }
@@ -160,6 +160,12 @@ impl Sequencer {
                     break;
                 }
 
+                // Sleep the machine.
+                if machine.sleeping {
+                    self.statuses.insert(id, Sleeping);
+                    break;
+                }
+
                 // Halt the machine if we reached the end of the program.
                 if machine.should_halt() {
                     self.statuses.insert(id, Halted);
@@ -171,6 +177,17 @@ impl Sequencer {
         Ok(())
     }
 
+    /// Wake the machine up from sleep.
+    pub fn wake(&mut self, machine_id: u16) {
+        // Resume the machine's execution state.
+        self.statuses.insert(machine_id, Running);
+
+        // Reset the machine's sleeping flag.
+        if let Some(machine) = self.get_mut(machine_id) {
+            machine.sleeping = false;
+        }
+    }
+
     pub fn is_halted(&self) -> bool {
         self.statuses.values().all(|s| s == &Halted || s == &Invalid || s == &Errored)
     }
diff --git a/machine/src/sequencer/status.rs b/machine/src/sequencer/status.rs
index 9d29e16c..d60838bf 100644
--- a/machine/src/sequencer/status.rs
+++ b/machine/src/sequencer/status.rs
@@ -22,6 +22,9 @@ pub enum MachineStatus {
     /// Machine is awaiting a message.
     Awaiting,
 
+    /// Machine is sleeping for a pre-determined duration. zzzzzz!
+    Sleeping,
+
     /// Machine has reached the end of execution.
     Halted,
 
diff --git a/machine/tests/sleep.rs b/machine/tests/sleep.rs
index 6f29726c..7c745e16 100644
--- a/machine/tests/sleep.rs
+++ b/machine/tests/sleep.rs
@@ -13,7 +13,7 @@ mod sleep_tests {
             .into();
 
         m.run().expect("cannot run the test program");
-
+        assert_eq!(m.sleeping, true);
         assert_eq!(m.mem.read_stack(2), [0xFF, 0xAB]);
         assert_eq!(m.events[0], Event::Sleep {duration: SleepDuration::Tick(10)});
         assert_eq!(m.events[1], Event::Sleep {duration: SleepDuration::Ms(200)});