Put the summary of the bug you're having here
What I expected to happen was...:
The game would run as normal
What actually happened was...:
I have left minecraft running and closed my computer, or had my computer power off and performed a system resume and I could continue playing minecraft without any problems. My computer ran out of battery last night while in sleep mode, I plugged it in this morning and started a system resume everything seemed find with my computer but minecraft (which was still running from the previous night) was now very glitchy. I can see through walls and see all open spaces throughout the maps (caverns, tunnels I've dug, everything) also my pickaxe has a purple/pink box grid shaped box around it. Now I'm not complaining about being able to see through walls but its probably not a good thing if this can be replicated so I reported it.
Steps to Reproduce:
This is how I did it at least, not sure if this can be reproduced.
1. Have a minecraft world running and close you're laptop to put it in sleep mode
2. Let laptop die while in sleep mode
3. Plug in laptop and start system resume
Other notes
I tried taking a screen shot using F2 and it saved as a completely black picture, not sure if that is part of the bug or a separate issue.
Probably your world is corrupted.
This issue happened here too while a power failure (multiplayer server). We had to restore the backup from the night before, because the server complained corrupt chunk files.
Assuming, you had Minecraft running as singleplayer, you may start Minecraft via batchfile
at least you'll get the output of the internal server.
Also assuming that your "sleep mode" was Suspend-to-RAM instead of Suspend-to-Disk it's relatively normal what has happended.
By closing the lid of your laptop while running the game you took the chance of the game to purge all unsaved files to disk.
Closing this issue for now, you may attach the log output of the batchfile.
Also you may take a look at the Mojang Support Center.