What you are experiencing is called 'Hypnagogic hallucinations', which simply meants the things that your brain registers as seeing just at the intervening period between being asleep and awake. These are common experiences and nothing to wrooy about. If you are undergoing stress because of this, you may consult a psychologist. You can consult these sites for some more info:
http://neurology.health-cares.net/hypnagogic-hallucination.php
http://www.patient.co.uk/showdoc/40002314/
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