Howdy, Hamlet. How you doin today? (Or tonight, whichever it is for you.)
Honestly? You are not a drug abuser. You simply want to go to sleep. But yes, this is very dangerous.
Have you talked to your doctors about this? Maybe they can give you sleeping medicine or ADHD-midnight-pills. Or they can suggest a higher dosage of your medications or I don't know. But I recommend going to your doctor for sure. I'm not a professional and I cannot tell you what medicine to take or how much because I don't know how your body will react too it. So, really, the only person that can help you in this situation is your doctor.
Please do not try to mix medicines again. I'm very worried about you and I know it's all in good intention and I feel bad cause all you want to do is sleep. But, for now, staying up a while is better then being in the hospital looking like you overdosed, right?
Thinking of you, stay safe.