Think TB display is locking up too
Along with my network problems randomly when the setup actually wakes up I think the display is locking up while asleep. On a 2011mba13 I clicked apple, sleep. Several hours later I went to wake the setup but got no responce from the bluetooh keyboard (bluetooth is set to wake computer). I plugged phone into usb on the display, not charging. I open the air and press its keyboard, it doesn't wake up. I unhooked the air's power from the display and the green status led stayed on the plug. Finally I unplugged the TBolt cable (which was hot) and the led went off on the power plug, the phone instantly started charging, and the air woke up its own screen. I plugged the Tbolt cable back in and its working fine at the moment.
ThunderBolt Display-OTHER, Mac OS X (10.7.1), 2011 Macbook Air 13