Black screen, briefly; hibernation? why?

Late 2011 MBP, 16GB RAM.  As of the last few days, sporadically the screen goes black, everything goes silent -- for about 30 seconds, maybe once a day, maybe twice (I use the machine off and on through the day). 
I've had various updates that are preparations for installing Mavericks; still at 10.8.5 though.  No idea why this started.
Opening Console quickly just now as soon as it happened (yes, I am up at almost 4am)  I see
11/14/13 3:52:11.000 AM kernel[0]: IOHibernatePollerOpen(0)
11/14/13 3:52:11.000 AM kernel[0]: encryptStart 13310
11/14/13 3:52:11.000 AM kernel[0]: bitmap_size 0x7f5a0, previewSize 0x1d3ea0, writing 2249983 pages @ 0x266750
11/14/13 3:52:11.000 AM kernel[0]: IOPolledInterface::checkForWork[5] 0xe00002eb
11/14/13 3:52:11.000 AM kernel[0]: PMStats: Hibernate write took 150 ms
11/14/13 3:52:11.000 AM kernel[0]: all time: 150 ms, comp bytes: 17481728 time: 13 ms 1220 Mb/s, crypt bytes: 12898032 time: 20 ms 613 Mb/s,
11/14/13 3:52:11.000 AM kernel[0]: image 0 (0%), uncompressed 17477632 (4267), compressed 10416960 (59%), sum1 607a0032, sum2 0
11/14/13 3:52:11.000 AM kernel[0]: wired_pages_encrypted 4268, wired_pages_clear 0, dirty_pages_encrypted 0
11/14/13 3:52:11.000 AM kernel[0]: hibernate_write_image done(e00002eb)
11/14/13 3:52:11.000 AM kernel[0]: sleep
11/14/13 3:52:11.000 AM kernel[0]: Wake reason: EHC2

Quoting a bit more from Console -- I do have a fairly new (several weeks) refurb Airport Express in place, replacing an old Linksys -- is that causing the problem maybe?  I see:
11/14/13 3:52:17.371 AM WindowServer[225]: Created shield window 0xba8 for display 0x003f003d
11/14/13 3:52:17.371 AM WindowServer[225]: handle_will_sleep_auth_and_shield_windows: no action for lock state 1
11/14/13 3:52:17.372 AM WindowServer[225]: Created shield window 0xba9 for display 0x003f003e
11/14/13 3:52:17.372 AM WindowServer[225]: handle_will_sleep_auth_and_shield_windows: no action for lock state 1
11/14/13 3:52:17.374 AM WindowServer[225]: handle_will_sleep_auth_and_shield_windows: no action for lock state 1
11/14/13 3:52:17.000 AM kernel[0]: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
11/14/13 3:52:17.000 AM kernel[0]: AirPort_Brcm43xx::checkInterfacePowerState: Check _pwrOffThreadCall!
11/14/13 3:52:17.000 AM kernel[0]: Previous Sleep Cause: 5
11/14/13 3:52:17.000 AM kernel[0]: The USB device HubDevice (Port 1 of Hub at 0xfa000000) may have caused a wake by issuing a remote wakeup (2)
11/14/13 3:52:17.000 AM kernel[0]: The USB device USB-PS/2 Trackball (Port 3 of Hub at 0xfa100000) may have caused a wake by issuing a remote wakeup (3)
11/14/13 3:52:17.000 AM kernel[0]: HID tickle 113 ms
11/14/13 3:52:17.000 AM kernel[0]: TBT W (1): 0 [x]

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