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I saw this message created by a native speaker:「よい夢{ゆめ} **を** 」.  
That seemed strange to me. I would have expected: 「よい夢 **へ** 」.

My thinking right now is that:

  1. 「よい夢を」 is a straight contraction of 「よい夢をみてください」。 Such a contraction is typical of how to use Japanese in instant messaging. 
  2. 「よい夢へ」 is something you would say in a conversation. And, it has more of an abstract meaning. A "good dream" is perceived as a destination towards which the speaker is hoping you will advance to.
  3. 「よい夢ありますように」 is sort of the formal version of 「よい夢へ」。I think that the meaning is like "I hope that you get into the state of having a good dream."?

Am I correct on any of points 1, 2, or 3?
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2014-07-14T17:45:54.053
17802
2014-07-18T23:16:19.950
2014-07-17T23:11:15.127
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particles set-phrases
Can you say "よい夢へ" instead of "よい夢を"?
よいXを is an expression you can find in many other cases. Mostly with 年 and 旅 .
It should be followed by 祈ります or something on the same line, meaning I
pray/hope that you have a good X. Here most certainly it is よい夢を見て下さい, I mean,
this is what the sentence means, but the usage of yoi makes dropping the verb
more natural. If you want to use the verb, いい夢を見て下さい is probably more
frequently used.

Ending the sentence at the postposition is perfectly fine with a lot a
postpositions, and it's particularly frequent in written language (a lot of
advertisements uses this style).

> I pray you will have よい旅を。よい年を。御運を。  
>  Let's go toward よい明日へ。 (not literally: a good _future_ /a _better_
> tomorrow)  
>  I'll wait/Stay well また会う日まで  
>  Stay 元気で(いて)ね。達者でな。  
>  (体を／健康を)お大事に(して)。

  
Sometimes it happens in the middle of a sentence.

> お元気で(いて)ね is an example.

This is a sign I've seen on the net:  

> まだ平気と  
> 飛び出す心が事故のもと

meaning まだ平気(だ)と(思って)飛び出す心が事故のもと(だ)

  
Actually you can drop postpositions too:

> 守ろうルールとマナー(を)  
>  _(The inversion of topic/subject/object with a verb is another interesting
> phenomenon.)_  
>  子供の飛び出し(に注意して)

However you can't do anything like this if it's not obvious for you and the
listener what's the verb the should follow: it MUST be clear from context. So
if you say よい夢へ it's not clear what you mean, you can't just end it with へ
because is convenient, it needs to make sense in the context.

_If you find the answer unsatisfactory please post a comment instead of just
downvoting._
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2014-07-14T22:04:34.290
17807
2014-07-15T10:01:13.363
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* 「よい夢を」 is the normal* way of saying "Sweet dreams" not just in emails or instant messages but also in conversations or letters. As Kokoroatari says, 「よい年を」is also common, and is the normal way of wishing someone a happy new year. While it's true that it's a contraction (probably of 「よい夢をみてください」), the short version is more natural. In English, instead of saying "good night, sweet dreams" you could say "I wish you a good night, and I hope that you have sweet dreams" but it would sound overly formal.

  * 「～ますように」 is a pattern which indicates a prayer to a god or heavenly power (whether Shinto, Buddhist, Christian or something else). The ます form in the middle of the sentence is presumably because when you're talking to a god, you need to be extra polite. It's the form that you normally use to write _tanzaku_ for _tanabata_. 「よい夢をみますように」 would be the way to say "I pray that you have good dreams" but it seems like overkill to resort to prayer, unless you're talking to someone who's troubled by recurring nightmares.

  * 「～へ」 can be used in phrases such as 「未来へ！」 which I take as meaning something like 「未来へすすめ！」 "Onwards, to the future!" However, it sounds strange to say "Onwards, to sweet dreams!" so I don't think it can be used with 「よい夢」, at least not in this sense. In the right context, 「～へ！」 might also be used as a way of making a toast (a short version of 「～へ乾杯！」), and so maybe the phrase you mention, 「平和へ」, was being used in this way. But in that case, the meaning would be closer to a celebration of peace, not a hope for more peace, so again, 「よい夢」 wouldn't fit.

*Edit: In this answer, I make it sound as if everyone uses 「よい夢を」 all the time, but 非解答者 makes the point that the cultural habit of saying something meaning "sweet dreams" is non-existent in Japanese. I (belatedly) endorse this. In fact, anyone who says 「よい夢を」 is probably thinking of the English phrase "sweet dreams" and trying to provide a Japanese equivalent. However, if you want to say "sweet dreams" in Japanese, I think that 「よい夢を」 is the best fit.
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2014-07-14T23:07:16.070
17808
2014-07-18T23:16:19.950
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Suggestion (1) sounds correct:

夢 is typically used with the verb 見る and the particles を or に：

> 母のことを夢に見た | I saw my mother in a dream  
>  父に会った夢を見た | I dreamt that I met my father

So, as you suggest in (1), the verb in よい夢を is probably 見る.

The よい＿を construction is used with other words. よい週末を comes to mind. In that
case the verb would be something like 過ごす, which also takes the particle を：

> よい週末を過ごしください。| Have a good weekend.

I not sure what verb you have in mind for よい夢へ to be used in an expression
wishing sweet dreams - your (2) and (3) do not sound right. In Japanese dreams
are "seen" or "described" or "had" in the sense of 持つ rather than in the sense
of ある/exist. However, 夢 does seem to get used with へ in expressions like 夢への道
which would mean "the road to your dreams". In this case I think the full
expression would be 「夢へ歩む道」.

BTW: If I google よい夢へ then I get one result: 「よい夢へのイメージに繋がる４つのポイント」(last line
in 1st section of <http://serendipity-japan.com/meaningofadream-489.html>).
But again, this is still not the use you had in mind of wishing someone
"sweet" dreams. I take it to mean the "four key points related to the image of
your ["sweet"] dream" and expect the full expression to be something like:
良い夢[に対して]の [ イメージに繋がる４つのポイント ]but somebody must be able to improve on this.
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2014-07-15T00:13:36.627
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2014-07-15T08:30:43.360
2014-07-15T08:30:43.360
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