[Home](./index.md) > [bitburner](./bitburner.md) > [NS](./bitburner.ns.md) > [asleep](./bitburner.ns.asleep.md) ## NS.asleep() method Suspends the script for n milliseconds. Doesn't block with concurrent calls. **Signature:** ```typescript asleep(millis?: number): Promise; ``` ## Parameters

Parameter	Type	Description
millis	number	_(Optional)_ Number of milliseconds to sleep. Default to 0.

**Returns:** Promise<true> A promise that resolves to true when the sleep is completed. ## Remarks RAM cost: 0 GB Note that the actual delay may be longer than intended. For more information, please check [https://developer.mozilla.org/en-US/docs/Web/API/Window/setTimeout\#delay](https://developer.mozilla.org/en-US/docs/Web/API/Window/setTimeout#delay).