This Tool Allows You To Track Your Friends' Sleep Patterns Via Facebook

Developer says tool was meant to highlight just how much can be gleaned from the data trails we leave.

If a friend came up to you and told you he knows when you're sleeping and when you're not, you'd probably think he spends his time sitting across the street from your bedroom window with binoculars and a box of donuts, but the truth is far scarier. Now someone doesn't need to physically stalk you (or visually monitor you in any way) to know when you're sleeping. They simply have to download this source code from GitHub, which allows any of your friends to compile a profile of your sleeping habits from your Facebook usage data.

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