Well that's actually a positive thing, I would suggest you keep a pen & pad by your bed & write them down. They are away of healing your mind it also shows that your a deep person & very intune with the feelings of others, so don't be disheartened by them. Cats can be due to an overbearing female presence in your life which inlight of what you say about your mother in your case is probably why their chasing you. I don't know but maybe she`s an interfering old bag that wont leave you alone. Hospital, symbolizes your need to heal your physical or mental health, or suggests you are giving up control of your own body. Perhaps you are afraid of losing control.
Whatever they represent to you I would definitely advise you to get to know them & be at one. This is your mind it`s not a good thing to shut it off or ignore what it`s telling you.