If it isn't causing any problems at hope than I wouldn't stress too much.

Violet sometimes sneeks in my bed of a night (my partner works nights too) but it's not every night. When my partner is home and in our bed and she sneeks in she really is a bit much, esp when she is restless. She goes back to her own bed fine tho.

I am sure that if my partner worked days and was in our bed every night it would be a little more unwelcome tho.