Ibn Majah

Benefits and Issues:
The word "believer" (mumin) indicates that even if a disbeliever's (kafir's) dream turns out to be true, it is not a means of honor from Allah; rather, it is just like when a disbeliever is tested in this world by being given other blessings and rulership, etc.

Hadith Commentary:
Through whom glad tidings are received.
Regarding the friends of Allah (awliya Allah), in the verse: ﴿Lahumul bushra fil hayati dunya﴾, these very glad tidings (mubashshirat) are mentioned.
Since the day I began the service of the Noble Qur’an and Sahih al-Bukhari, Allah has shown me many glad tidings (mubashshirat) in dreams.

Hadith Commentary:
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The Messenger of Allah (sallallahu alayhi wa sallam) narrated the aforementioned hadith during his final illness. Thus, Ibn Abbas (radi Allahu anhu) states that the Messenger of Allah (sallallahu alayhi wa sallam) lifted the curtain during his illness, while he had his head wrapped due to the sickness, and the people were performing prayer behind Abu Bakr (radi Allahu anhu). He (sallallahu alayhi wa sallam) said:
“O people! Of the glad tidings of Prophethood, only good dreams remain, which a Muslim sees.”
(Sahih Muslim, Kitab al-Salat, Hadith: 1074(479))
This absolutely does not mean that whoever sees a good dream receives a portion of Prophethood, because in this hadith, the matter of dreams has been likened to Prophethood.
If a person loudly proclaims “Ashhadu an la ilaha illa Allah,” he is not called a muezzin, even though this phrase is a part of the adhan.

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Hafiz Ibn Hajar (rahimahullah) has written, quoting from Muhallab, that interpreting good dreams as “glad tidings” (mubashshirat) is due to predominance, because some dreams are true, but Allah, the Exalted, shows them to the believer so that he may prepare himself for an incident that will occur in the future—that is, instead of being glad tidings, they are warnings (mundhirat).
(Fath al-Bari: 12/470)

Benefits and Issues:
It is established from the Qur’an and Hadith that dreams are a real phenomenon.
They can be both true and false.
True dreams are from Allah, the Mighty and Majestic, and false ones are from Satan.
In fact, it is a particular characteristic of the Prophets and Messengers (sallallahu alayhi wa sallam)
that their dreams are entirely true and are a type of revelation (wahy).
And the beginning of the Prophethood of the Messenger of Allah (sallallahu alayhi wa sallam) was also through dreams.
As for the dreams of ordinary Muslims, which they see in a state of health and balance, they too are generally true.
And these have been considered as one forty-sixth part of Prophethood.
However, the matter of their interpretation remains hidden.
Sometimes a person of knowledge understands their reality,
and sometimes he fails to reach their depth.