For the most comfortable reach, aim for your bedside table to sit level with...

https://magic-wiki.win/index.php/If_My_Bed_Is_Modern_and_Low,_What_Nightstand_Style_and_Height_Works%3F

For the most comfortable reach, aim for your bedside table to sit level with your mattress top or just 5 to 10 cm below it. Most UK beds work best with a table height between 55 and 70 cm