# Havok - wake up from sleep mode

**URL:** <https://forum.babylonjs.com/t/havok-wake-up-from-sleep-mode/40852>\
**Category:** Questions\
**Tags:** physics\
**Created:** [May 16, 2023, 9:40am UTC](https://forum.babylonjs.com/t/havok-wake-up-from-sleep-mode/40852 "2023-05-16T09:40:52Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![eoin](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@eoin](https://forum.babylonjs.com/u/eoin)\
**Post date:** [May 22, 2023, 8:09am UTC](https://forum.babylonjs.com/t/havok-wake-up-from-sleep-mode/40852/6 "2023-05-22T08:09:38Z")

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Oh sorry! I _totally_ missed this last week; was pulled into some projects which took a bunch of my time. The upcoming version of the WASM will have additional functions for sleep control, but looks like you’ve found a bug; changing some of the constraint params don’t send an activation request to the attached bodies. I’ll be sure to get this fixed up too, but Raggar’s workaround should hold you over 'til then. Thanks Raggar!

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