For the perfect bedside setup, aim for your table to sit 5 to 10 cm below the...

https://fun-wiki.win/index.php/The_Bedside_Blueprint:_Why_Your_Nightstand_Height_Matters_More_Than_You_Think

For the perfect bedside setup, aim for your table to sit 5 to 10 cm below the top of your mattress. This makes reaching for your phone or a glass of water comfortable without straining your arm