[ardit33]

Entering Limbo = Memory Leak. The reference to an object is nullified (the subject's projection/reference is killed in the dream), so the object is leaked and there is no way to access it, until either a garbage collection happens, or when the parent process is stopped. (i.e. the subject is awaken up).

[nhnifong]

Garbage collection offers a nice explanation for why limbo is only a problem under the influence of the "strong sedative". If garbage collection is a feature of normal dreaming, the "strong sedative" disables it. If you can stretch the metaphor further be my guest.