HT1776 MacBook does not sleep when closed

I have a Late 2013 Retina Macbook Pro running Mavericks.  Sometimes when I close the lid, it does not sleep or turn off the display, even after the set time in Energy Saver preferences.  My main concern is that I have my security settings set to lock my computer 5 seconds after sleep/turning off the display, and this does not happen, as it does not go to sleep.  The only way I notice is that when I open the computer some time later, the screen is already on and it is not locked.  There are no periphials connected when this happens.

Sleep - Why your Mac might not sleep or stay in sleep mode
Sleep - Won’t

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