This has been happening to me as well and I know there are quite a few books on Numbers and Angels. One of them that I know of is called, Angel Numbers: The Message and Meaning Behind 11:11 and Other Number Sequences by Kyle Gray. I'm planning on buying this one too in the future.
Connecting with the Angels Made Easy: How to See, Hear and Feel Your Angels
by Kyle Gray.
As for the 4:44, I believe this is what it means.
