Work leaks into your personal life, news and preoccupations leak into your personal life, continuous demands of attention leak into your personal life.
And to some extent, that is fine.
At some point though, that becomes untenable, and that is precisely what you need to be aware of. When does that happen? How does that manifest? What can you do about it*?
Lacking a system that keeps this in check means gradually losing track of yourself, your thoughts, your strengths, your limits.
No work, preoccupation, demand can be tackled if that happens.
* I have recently started keeping two distinct apps for emails, one for personal emails (that I have heavily cleaned and optimized) and one for work emails. If you tend to drift to work stuff in your free time, you might give this a try.