Hi It is necessary to know what is causing you to have fear of sleeping alone. You used to share a room with your brother and now you have to sleep alone. Your concern is you get nightmares. To feel better consult a psychologist and counseling sessions will help you. With a psychologist you can talk about your lifestyle and dietary habits. I understand you are afraid to sleep alone. It is important to remember that you can overcome fear of sleeping alone and feel calm.

Hi Keep dim light switch on. Before sleep do PMR PAM exercises

Hello there I can understand what you might be going through. It might be hard for you to have a sound sleep at night. You might also be getting distracted as well as scared and helpless due to your horror dreams. Don't worry, consult a good therapist or a psychologist as soon as possible. You can also contact me and I will try to help you in this. Let's discuss your issues in detail so that you can get towards your solutions. Take care. Stay safe and strong. Everything will be alright. You got this!

Counseling is required to help you in this situation.

Hi... I suppose the antidepressant you are consuming is prescribed by a Psychiatrist. If not, please consult one before consuming such medications. Typically, issues with sleeping alone are rooted in fear, grief, hormones, habit. They also suggest a possibility of some repressed subconscious issue. Dream Analysis may help you get better insights. Also, since sleeping alone or with someone is a habit, which means it is learnt, so it can always be unlearned or relearned.