The golden rule for bedside tables is comfort and accessibility. Aim for a...

https://www.start-bookmarks.win/for-maximum-comfort-your-bedside-table-should-ideally-sit-5-10-cm-below-the

The golden rule for bedside tables is comfort and accessibility. Aim for a height between 55 cm and 70 cm to match your mattress. For the most natural reach, your table surface should sit about 5 cm to 10 cm below the top of your mattress