I found だんだんと in this sentence but I'm not sure how it's different from だんだん?

女は毎日働いたので、だんだんと元気がなくなっていました。

([Source](https://www.wasabi-jpn.com/japanese-lessons/3-4-the-crane-of-
gratitude/))
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2020-08-27T12:13:20.670
80355
2020-08-27T13:17:33.440
40084
question
word-choice
Are there any differences between だんだんと and だんだん?
I found the answer
[here](https://japanese.stackexchange.com/questions/42163/what-does-
adding-%E3%81%A8-after-an-adverb-do). It seems they add と after adverb just to
stress the meaning of the adverb.
CC BY-SA 4.0
2020-08-27T12:51:29.913
80356
2020-08-27T12:51:29.913
40084
80355
answer