To get your bedside table height just right, aim for the top of the surface to...

https://www.yankee-bookmarkings.win/for-the-perfect-setup-aim-for-your-bedside-table-to-sit-level-with-your

To get your bedside table height just right, aim for the top of the surface to sit roughly 5-10 cm below your mattress-top. This makes reaching for your phone or a glass of water feel natural while you are in bed