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

https://city-wiki.win/index.php/Bedside_Table_Height_for_a_75_cm_Mattress_Top:_The_Ultimate_Guide

The golden rule for bedside tables is comfort and accessibility. Aim for a height that sits between 5 and 10 centimetres below the top of your mattress. Most UK beds work best with tables in the 55 to 70 centimetre range