hangs on waking from sleep in Mac OS X

[Mitchell L Model]

If Emacs 21.4 is the front application (running as itself, not in a 
terminal window) it hangs with a spinning cursor when my Mac (OS 
10.2.4) wakes from sleep (whether put to sleep manually or 
automatically, both on my Ti PowerBook and my Cube).  Anyone else 
having this problem or know what to do about it?  (Other than not 
leaving Emacs front when putting the Mac to sleep or walking away 
from it, of course.)