Ceiling light shines without electricity?

Good Morning,

we have the following problem,

Since early this morning, two LED ceiling lights have been glowing faintly. They weren't on before; as if by magic, they started glowing. They were off during the day, but now, in the dark, they light up again. I've tried turning off the fuse, but it doesn't work. One light is in the utility room on the ground floor, and the other is in the bedroom upstairs.
Nothing has been done to the electrical system in the last few weeks and no new consumers have been added.

Anyone have any idea what could be causing this?

Sincerely, Abedin