Looking on the internet deeply has found these results:

in the early morning is the most popular phrase on the web.

early in the morning 112,400,000 results on the web	in the early morning 112,600,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	In the early morning, you can collect dewdrops from leaves that were carefully laid out the previous evening. In the early morning, there will be thick fog in areas near the mountains. Most of his stops were made in the early morning. See if anyone came in in the early morning hours with a broken arm or a sprained wrist. The first one was killed 3 months ago, both in the early morning. I want to get there in the early morning for breakfast. You... coming out of a glass door in the early morning, still sleepy. With particular regard to the Carloforte/Calasetta route, it appears that the private operator has been receiving regional subsidies since 1998 for operating the route at night and in the early morning.

early in the morning

112,400,000 results on the web

in the early morning

112,600,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

In the early morning, you can collect dewdrops from leaves that were carefully laid out the previous evening.
In the early morning, there will be thick fog in areas near the mountains.
Most of his stops were made in the early morning.
See if anyone came in in the early morning hours with a broken arm or a sprained wrist.
The first one was killed 3 months ago, both in the early morning.
I want to get there in the early morning for breakfast.
You... coming out of a glass door in the early morning, still sleepy.
With particular regard to the Carloforte/Calasetta route, it appears that the private operator has been receiving regional subsidies since 1998 for operating the route at night and in the early morning.