How do I wake all physics objects?

Development World Creation
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#Object or Actor Iterator

You can iterate over all objects of a certain parent class using Object or Actor Iterator

So you could do a search over all Static Mesh Actors and wake all their components, for example

Please note the Iterators are dynamically calculating all current objects or actors in the scene, so if you delete stuff it will not be iterated over any more.

and if you spawn / add stuff it will be found!

#Wiki Tutorial Link

A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine ForumsObject%26_Actor_Iterators,_Optional_Class_Scope_For_Faster_Search