Why are there black ladybug-like bugs on the bed?

Could it be that the sanitation of bedbug's house is serious and needs to be thoroughly cleaned?

If it's not a bug, could it be the smell of some nearby plant or aphid that attracts them? Watch carefully and see where they often climb.

Maybe you can burn the orange peel. The smell of orange peel can kill insects. But it's better to clean up the environment and spray pesticides.