It sounds frustrating to have your sleep disrupted like this, especially after starting new cough medicines. Acebrophyllin and Acetylcysteine can sometimes cause side effects such as restlessness or difficulty sleeping in some people.

• Your difficulty staying asleep after 2 to 3 hours may be related to these medications, as they can occasionally affect the nervous system or cause mild stimulation.
• It’s important to avoid caffeine or other stimulants in the evening and maintain a calm bedtime routine.
• If this sleep problem continues or worsens, you should consult a pulmonologist or your prescribing doctor to review your medications and consider alternatives or supportive treatments.

If you experience any other symptoms like chest pain, severe breathlessness, or confusion, seek emergency care immediately. Otherwise, a specialist can help adjust your treatment to improve both your cough and sleep quality. If you want, I can explain more about how these medicines might affect sleep.To narrow down potential causes, we will need some more information.I understand you're having trouble sleeping. Could you please share your age and gender?