Black screen during sleep mode (10 second lag)?

Okay, so I love my Mac and I freak out every time I notice something weird. Call me crazy.
Macbook Pro Retina (Late 2013) OS X Mavericks 10.9.4
Whenever my Mac mac goes into sleep mode (idle) and I try to reach my log in screen, a blank black screen shows up. I can move the cursor around however, it takes 10 seconds for my user screen to show up. I restarted my computer and it's doing the exact same thing. Should I be concerned?

Blank (lighted, but black) screen with cursor at bootup
[SOLVED] - Macbook Air Sleep/Wake problem
Dark screen on start-up can only see curser

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