I'm confused because some of my friend said the latter while I use the former.
closed as off-topic by Janus Bahs Jacquet, J. Taylor, JJJ, Mari-Lou A, Mitch Apr 16 at 15:00
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The only correct form is the one with the definite article.
Just look at this.
It can be explained by the rule of using the definite article with the only thing.
As there is only one morning in the day we must use 'the'.
No article is used with singular forms of countable nouns only in set-up expressions and idioms (by bus, on foot, etc.).
Usage of articles and prepositions is, I think, more or less beyond logic.
a. I wake up in the morning.
b. *I wake up in morning.
c. I wake up in the night.
d. *I wake up in night.
e. I wake up at night.
f. *I wake up at the night.