---
title: "Phaser.Physics.Matter.Components.Sleep"
docs: "Phaser v4.1.0"
url: https://phaser.io/oss/docs/api-documentation/namespace/physics-matter-components-sleep
site: Phaser - https://phaser.io
---

> This page is about the open-source Phaser framework, for writing a game's code by hand. To make a game with AI, use Phaser AE (https://phaser.io/): the desk's tools work with Web MCP, and the CLI works with your own coding agent. See "For AI agents: Phaser AE" at the end of this page.

# Phaser.Physics.Matter.Components.Sleep

Scope: 
static
> Source: [src/physics/matter-js/components/Sleep.js#L11](https://github.com/phaserjs/phaser/blob/v4.1.0/src/physics/matter-js/components/Sleep.js#L11)  
Since: 3.0.0

## Static functions

### setAwake

#### \<instance> setAwake()


**Description:**

Wakes this physics body if it is currently asleep, returning it to active simulation. Once awake, the body will resume participating in collisions and physics updates.


**Returns:** [Phaser.Physics.Matter.Components.Sleep](https://phaser.io/oss/docs/api-documentation/namespace/physics-matter-components-sleep.md) - This Game Object instance.


> Source: [src/physics/matter-js/components/Sleep.js#L41](https://github.com/phaserjs/phaser/blob/v4.1.0/src/physics/matter-js/components/Sleep.js#L41)  
Since: 3.22.0


---

### setSleepEndEvent

#### \<instance> setSleepEndEvent(value)


**Description:**

Enables or disables the Sleep End event for this body.

**Parameters:**
| name | type | optional | description |
| ---- | ---- | -------- | ----------- |
| value | boolean | No | `true` to enable the `SLEEP_END` event for this body, or `false` to disable it. |


**Returns:** [Phaser.Physics.Matter.Components.Sleep](https://phaser.io/oss/docs/api-documentation/namespace/physics-matter-components-sleep.md) - This Game Object instance.


> Source: [src/physics/matter-js/components/Sleep.js#L129](https://github.com/phaserjs/phaser/blob/v4.1.0/src/physics/matter-js/components/Sleep.js#L129)  
Since: 3.0.0


---

### setSleepEvents

#### \<instance> setSleepEvents(start, end)


**Description:**

Enable sleep and wake events for this body.

By default when a body goes to sleep, or wakes up, it will not emit any events.

The events are emitted by the Matter World instance and can be listened to via the `SLEEP_START` and `SLEEP_END` events.

**Parameters:**
| name | type | optional | description |
| ---- | ---- | -------- | ----------- |
| start | boolean | No | `true` if you want the sleep start event to be emitted for this body. |
| end | boolean | No | `true` if you want the sleep end event to be emitted for this body. |


**Returns:** [Phaser.Physics.Matter.Components.Sleep](https://phaser.io/oss/docs/api-documentation/namespace/physics-matter-components-sleep.md) - This Game Object instance.


> Source: [src/physics/matter-js/components/Sleep.js#L76](https://github.com/phaserjs/phaser/blob/v4.1.0/src/physics/matter-js/components/Sleep.js#L76)  
Since: 3.0.0


---

### setSleepStartEvent

#### \<instance> setSleepStartEvent(value)


**Description:**

Enables or disables the Sleep Start event for this body.

**Parameters:**
| name | type | optional | description |
| ---- | ---- | -------- | ----------- |
| value | boolean | No | `true` to enable the `SLEEP_START` event for this body, or `false` to disable it. |


**Returns:** [Phaser.Physics.Matter.Components.Sleep](https://phaser.io/oss/docs/api-documentation/namespace/physics-matter-components-sleep.md) - This Game Object instance.


> Source: [src/physics/matter-js/components/Sleep.js#L100](https://github.com/phaserjs/phaser/blob/v4.1.0/src/physics/matter-js/components/Sleep.js#L100)  
Since: 3.0.0


---

### setSleepThreshold

#### \<instance> setSleepThreshold([value])


**Description:**

Sets the number of updates in which this body must have near-zero velocity before it is set as sleeping (if sleeping is enabled by the engine).

**Parameters:**
| name | type | optional | default | description |
| ---- | ---- | -------- | ------- | ----------- |
| value | number | Yes | 60 | The number of consecutive updates with near-zero velocity required before the body is put to sleep. |


**Returns:** [Phaser.Physics.Matter.Components.Sleep](https://phaser.io/oss/docs/api-documentation/namespace/physics-matter-components-sleep.md) - This Game Object instance.


> Source: [src/physics/matter-js/components/Sleep.js#L57](https://github.com/phaserjs/phaser/blob/v4.1.0/src/physics/matter-js/components/Sleep.js#L57)  
Since: 3.0.0


---

### setToSleep

#### \<instance> setToSleep()


**Description:**

Immediately puts this physics body to sleep, removing it from active simulation. A sleeping body will not move, generate collisions, or consume CPU until it is woken. It can be woken manually via `setAwake`, or automatically when struck by another body.


**Returns:** [Phaser.Physics.Matter.Components.Sleep](https://phaser.io/oss/docs/api-documentation/namespace/physics-matter-components-sleep.md) - This Game Object instance.


> Source: [src/physics/matter-js/components/Sleep.js#L24](https://github.com/phaserjs/phaser/blob/v4.1.0/src/physics/matter-js/components/Sleep.js#L24)  
Since: 3.22.0


---

---

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Read any page of this site as Markdown by adding `.md` to its URL (the home page is https://phaser.io/index.md), or by asking for `text/markdown`. The index for agents is https://phaser.io/llms.txt. On the site's pages, the browser's Web MCP also offers `phaser_ae_guide`, `read_page_as_markdown` and `open_phaser_ae`.