I know which technique I'd like to use but I have a problem

Try doing autosuggestion, all you have to do is tell your subconscious a specific time to wake up in the morning and you might wake up at that time. You should also do WILD + WBTB but that might not be best for you if you share a room with your brother and mother. Check out MILD.[First Steps to MILD (for all basic MILD related Q&A))