You are right: there are problems with sleep, on the MBP11,3 with OCLP 0.5.3… I made some quick tests, and it looks like automatic sleep works, while manual sleep (from the Apple menu) only partly works (with external SSDs going to sleep only randomly/sometimes); and sleep by closing the lid doesn’t seem to work at all: the Apple logo light turns off, but when the lid is opened again, there isn’t any password request, only the desktop, exactly as before. Yet another Nvidia Kepler issue, perhaps…?
nvram reset did the work for me. under the week whenever the Mac went to sleep bluetooth disconnected too