For a comfortable reach, your bedside table should sit level with the top of...

https://extra-wiki.win/index.php/The_Ultimate_Guide:_What_Nightstand_Height_Works_with_a_High_Box_Spring_Bed%3F

For a comfortable reach, your bedside table should sit level with the top of your mattress or up to 10cm lower. Most people find a height between 55cm and 70cm works perfectly for standard divans and frames