Angelique,

Can you sleep during the day if you couldn't during the night? Or would the voice come in the day too? What about if you sit/half sit while sleeping?

Also, please don't touch the heroin, the 1st time is the best they say, and all the later ones just looking for that 'perfect high'. I'd recommend trying to find some local RL people too... maybe a group for mentally ill people and/or a therapist?
If you'd be brave enough to find heroin, you could be brave enough to reach out for help too?

Before you'd resort to heroin or suicidal behaviour, it's better to go to a hospital you'd be comfortable to go to! Or call a hotline - there are very many hotlines and many volunteers!!