visitting dream world results in nightmare 100% of time at first
you can run from it and you have to gather disturbed cotton plants and then craft dreamcatcher of nightmares which makes it 50% to be a dream instead
i think it would be impossible to play because you would go insane in the first night of mining.. and its not only in dark, you have to see sunlight for your sanity to go up
well i got some weird crash when placing a clay bucket in furnace... but i dont think its the bucket cuz i already placed 3 others in furnaces
http://pastebin.com/pHyiRtEA