I always keep mine open, especially at night...i'm not afraid of anything in there, I just don't like not being able to see everything in my room. That's why I also go to sleep at night while keeping one eye open.
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I keep mine closed simply because it's a mess. Pretty sure if I kept it open for to long it'd just all spill out. You know how it is, lots of stuff, small room. Though, thinking about it, the thought of having the open is somewhat appealing, in a weirdly comfortable kind of way. Like a consistent mass of darkness, simply... watching.