Can you die from a sominex overdose?

Yes you can: You can die from sominex overdose which is dependant on the dose the fatal dose is about 100 tablets of 25 mgm is the fatal dose it is not that easy to die from Benadryl (diphenhydramine) overdose, some people take 500mgm to get high.

Yes: O/D sx's can include: Inability to urinate, Blurred vision, Dry mouth, Enlarged pupils, dry eyes, Ringing in ears, Low blood pressure, Rapid heart rate, Agitation, Confusion, Convulsions, Delirium, Depression, Drowsiness, Hallucinations, sleepiness, Nervousness, Tremor, Unsteadiness, Dry, red skin or death. REF: https://medlineplus.gov/ency/article/002634.htm