Sometimes (not often at all) i hear my mom say my name when she didn't actually say it. i don't hear anything else. is this normal?

Anxiety: If you are hearing voices you need to see a trained psychiatrist. If its just your mom's voice it may be anxiety. Either way you should seek help.

Hypnagogic : These are probably some version of hypnagogic phenomena . This usually takes place between wakefulness and sleeping. I myself have had occurrences like this while i was fully awake without any other symptoms. If you have other associated problems it would be best to see a neurologist .See:http://dreamdoze.Com/hypnagogia-secrets-tricks-solutions-transitional-hallucinations/.