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

https://www.bookmarking-jet.win/for-the-best-bedside-balance-aim-for-your-table-to-sit-5-to-10-cm-below-the

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 keeps your phone or book within easy reach without feeling like you are climbing up or down to grab them