İyi akşamlar,

I know this question might be a little lame but I´ve always wondered why is it "Hayallerim" and not "Hayallarım" ?

It even sounds wrong when you say Hayallarım 

You probably know that there are several exceptions to the vowel harmony rules. These exceptions are all words that were borrowed from other languages, and the final vowel is often pronounced ´lighter´ in Turkish.

Other examples of exceptions

saat - saatler (watches)

kalp - kalpler (hearts)

harf - harfler (letters of the alphabet)

maaş - maaşler (salaries) *read following post

rol - roller (roles)

festival - festivaller (festivals)

and also the proper name Kemal - Kemaller 

According to Mehmet, click here, the final ´l´ in some of these words softens the last vowel.

Mehmet also has more exceptions listed at the end of his lesson.

Hello.

It´s because of their Arabic origins. I don´t know if you know it or not, in Arabic, the letter alif is both ah and eh (Like Turkish pronounciation a & e). So, some words like harp are treated like their "e" origins and some are treated like "a".

 Hello, there´s ´â´ in Turkish. But we don´t use ´â´.  It´s not ´Hayallerim´. It´s ´Hayâllerim´. No one use it. This is sad. We must use it. But you can use it. It´s not problem. I´m Turkish and like to use ´â´. It name is ´Şapkalı a´(â. It came in Arabic.

  But sometime there isn´t ´â´ in some worlds. Like saat(it isn´t saât) . like like. Because this worlds is Arabic. Turkish= Turkish+Arabic+Persian

I hope u understand me. Good bye