while i am thinking about him all the time he comes only in my dreams

We have seen how the girl finds the dreamy state blissful as she can see him in the dream She says:

I derived an immense pleasure by seeing him

In my dream as was the case usually.

If there is no waking hours ,I will be with him perpetually

And my lover will not leave me in the dream.

(Now see the different tune that she adopts about her man appearing in the dream)

While denying all delight during day time (waking hours)

The hard hearted man does come in my dream

And torture me  in my sleep.

See his behavior: while I am asleep,

He is resting on my shoulder and

While I remain awake, he enters into my heart

My dear friend,when I think about him during waking hours,

He embraces me only in my dreams.

The separation of the lover tosses and turns her into a kind of recession to use the word in Economics and her longing to see and enjoy the company  is very much visible in her dialogue with her friend.