Yesterday I woke up and I totally remembered my dream . But I was kinda half asleep so I said to myself , "I’ll write it in my Dream diary when I get home from school . After 2 hours , I couldn’t remeber it anymore … 
Yep, they’re very easy to forget. I recommend keeping a piece of scrap paper by your bed and when you wake up, jot down a key word that might trigger your memory about a specific dream. That way if you go back to sleep/go somewhere and come back you’ll see the word(s) and remember. It usually works for me, and requires very little effort 
that’s good advice …
thanks ! 