when your lay in bed at night, how to not worry so much

i like my bed and enjoy going to bed, i put my electric blanket on at this time of year.....but commonly at night when i'm lay in the darkness, my mind wanders and i tend to think deeply about things and worry?

worry about my physical health, i have a few health issues and just worry about my elderly mother and things going on in the external world? things which i have no control over.

i worry about my loneliness predicament, living alone.

can anyone understand or know what to say?