Bismillahir Rahmanir Raheem
Assalam Alaikum Wa Rahmath Ullahi Wa Barkatahu
Hazrat Abu Said Al-Khudri (MABPWH) Reported :
I Heard The Messenger Of Allah 
[SAWW](PBUH) Saying,
" When One Of You Sees A Dream That He Likes,
Then it is From Allah.
He Should Praise Allah For it And Relate it To (others).''
Another Narration Adds :
Messenger Of Allah [SAWW](PBUH) Said,
" He Should Not Report it Except To Those Whom He Loves.
And if He Sees One Which He Dislikes,
Then it is From The Satan.
He Should Seek Refuge in Allah Against its Evil And Should Not Mention it To Anyone.
Then it Will Not Harm Him.''
{ Al-Bukhari Book 09, Chapter 87, Hadith 114 }
Lesson : As Mentioned Above in Surah Al-Anbiya Ayat 79.
" And Allah Subjected The Mountains And The Birds To Glorify Our Praises Along With Dawud (PBUH)"
There Are Clear instructions From Messenger Of Allah (PBUH) About Both Good And Bad Dreams. A Good Dream Means A Good News Sent By Allah To A Person Who Has Seen it. It Should Be Related Only To Those Who Are Close To His Heart And Not To Such People Who May Start Nourishing Malice Against Him Like The Brothers Of Prophet Yusuf (Joseph). A Bad Dream Should Be Attributed To Satan And Not Be Described To Others Because it Often Causes One To Be Pessimistic And it May Be Taken As A Bad Omen, Which is Not Allowed in Islam. Rather, A Man Should Seek Allah's Refuge Against its Evil. And if He Puts Faith in Allah, No Harm Will Come To Him.