greenblue wrote:
Sometimes I hear noises like someone was calling me or I hear music when I am in bed in a state between being awake and sleeping, but that must be normal I think.
That is a Hypnagogic Hallucination. It is VERY common but strangely few people talk about it... You can hear things or see things or both, some suffer from sleep paralysis too where they are paralysed and can't move but see horrible things, often creatures doing things to them or whatever (which is what seems to have caused tales of alien abduction and in the past of witches and other creatures "sucking the life out of people").
http://en.wikipedia.org/wiki/Hypnagogia
(If it happens when you wake up it's hypnopompic rather than hypnagogic)