Vivaphylline N Tablet may cause sleeplessness (insomnia) in some patients, although this side effect is uncommon and does not affect everyone. The active ingredient, acebrophylline, can stimulate the central nervous system in certain individuals, potentially leading to difficulty falling or staying asleep. If you experience sleep disturbances after starting this medication, consult your healthcare provider, who may adjust the timing of your dose or suggest an alternative treatment. To help reduce this risk, follow your doctor’s instructions carefully, take the medication in the morning or early afternoon, avoid caffeine and alcohol, and maintain a regular sleep schedule.