I recommend asking a doctor this kind of question, not asking this question on a public answers site such as Mahalo Answers.
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I wouldn't recommend it! It is dangerous to mix chemicals in your body. But if you are required to use Benedryl for allergies, than try to take it LONG before you are needing to go to bed.
Also, because Unisom is over the counter it wouldn't be required that you take it. I would strongly recommend that you don't do it. I know...try working out or something and than a hot shower, and relax your muscles before going to bed to see if that helps.
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This is definitely a question you should ask your doctor. As both of these medications can induce drowsiness, I would not mix them without speaking to your physician.
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It might be better to take only the Benadryl, since it already makes you drowsy it may help you get to sleep sufficiently by itself.
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Yes its bad. Take _only_ the Benedryl or the Unisom, NOT both. As mentioned they will both cause drowsiness. In fact, depending upon which type of Unisom it is, you may be taking a double dose of Diphenhydramine if you take both.

Unisom comes with two different possible active ingredients. They are both antihistamines and one is the same as Benedryl. Look at the active ingredient on the Unisom package. It may be Doxylamine or Diphenhydramine. If it is Doxylamine then that is a different medicine but still an antihistamine and sedative so it might help you sleep _and_ help your allergies. Also compare the dosage listed on the package for Unisom to the dosage on the Benedryl.

I would say skip the Benedryl for one night and take just the Unisom and see if that has any control over your allergies. Although if they are both the same dosage of Diphenhydramine then it won't matter. And as soon as you have a chance go see the doctor. If the Unisom actually controls your allergies and puts you to sleep the doctor might be okay with using just that on occasions where you have insomnia. The doctor might also give you an ok to take both but I doubt it.

If you have insomnia on a consistent basis you might need a prescription sleep aid (which would not be an antihistamine). Not sure how safe it is to take Unisom consistently and it definitely says not to do that.

Also, not to make it too complicated but if somehow it works out that you really need to take Unisom because that puts you to sleep _plus_ some kind of allergy relief then ask your doctor about taking Unisom with Zyrtec over the counter (_not_ Zyrtec-D) because its an antihistamine that causes much less drowsiness and so might be safer to take with Unisom.

Also, just a disclaimer (because I know someone else will probably point this out) I am not a doctor or pharmacist and we can't rely on Wikipedia or some other site to make decisions about this. Of course you need to discuss it with your doctor. However it cannot hurt to _try_ to make that a slightly more informed discussion.
Source(s):
http://en.wikipedia.org/wiki/Unisom
http://en.wikipedia.org/wiki/Doxylamine (Unisom possible active ingredient)
http://en.wikipedia.org/wiki/Diphenhydramine (Benedryl & Unisom other possible active ingredient)
http://en.wikipedia.org/wiki/Cetirizine (Zyrtec)

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Actually they would say not to take one with the other in their boxes. If they don't say you can't take both, then go ahead. Keep in mind it will probably really zonk you out.

Good luck waking up in less than 10 hours!! You'll be fine though, as long as you don't overdose.
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If by "this" you mean not disclose the subject of your question in the question itself, then yes. Otherwise, as the saying goes, knock yourself out. ;-)
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In general, this is a bad idea.

As has been pointed out, Unisom and Benadryl are both antihistamines, and adding them together can produce excessive drowsiness, including daytime drowsiness the next day, when you will probably need to function to some degree.

One of the questions you need to ask yourself is why you're not sleeping.

Check out www.sleepfoundation.org, where they have some sleep tips for you to try. They sound simple-quiet, dark bedroom-and easier said than done-reduce stress-but they are effective and drug free.

Believe me, I am in no way a poster child for sleep hygeine-I could use some of those tips myself-and I am not suggesting you can just decide to sleep better. But trying to solve the root of the issue is a better idea than simply trying to medicate it away.
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As the warning says on health issues, you really should not ask drug related questions like this on Mahalo. You will not get professional advice like this on the internet.... you have to go to a doctor.

Again, go to a doctor.

Did I mention to ask a doctor?
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Well, check the active ingredient in unisom - there are two preparations (as far as I know) and in one the active ingredient is dipenhydramine - this is also the active ingredient in Benadryl, so you're basically just taking more benadryl (which is a fine antihistamine, but also causes sleepiness in many people and is commonly used for that purpose as well). So I would watch the dose, and if you do get sleepy with Benadryl, you may not even need the unisom.
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