Yea, it's pretty common; especially if you haven't meditated before. It's really helpful if you use some binaural beats or tones from that link I had, while focusing on the actual "beat" you hear; it helps wake up the deeper parts of your mind, while your body continues to shut down.
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If you were using the tone... all I can say is: try to visualize the air going into your nose; then once you're really relaxed, picture the following colours (as you try looking "thru" your closed eyelids) in order: blue, green, yellow, and red.