Wiktionary
vb. 1 To enter something or somewhere by creeping. 2 (context idiomatic transitive English) To enter surreptitiously.
Usage examples of "creep into".
Like most good character builders, Anvil creates his memorable people for the reader through their interactions, and the edge of zaniness which seems to creep into almost everything he writes only makes them even more interesting.
The best expedient I could think of, was to creep into my house, which I accordingly did.
Larry could see the drops accreting on the Z's windshield now, as intimations of dawn began to creep into the eastern sky.
Anna heard the edge creep into the prince's voice that meant the Eagle's words had angered him, but perhaps the Eagle did not care, or did not know him well enough, to heed the warning.
A strange feeling began to creep into his mind as he struggled for every breath.