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

https://www.social-bookmarkings.win/for-the-perfect-setup-aim-for-your-bedside-table-to-sit-roughly-5-10-cm-below

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