For the best look and comfort, aim for your bedside table to sit between 55 and...

https://victor-wiki.win/index.php/The_Golden_Rule:_What_Does_%225-10_cm_Below_the_Mattress%22_Actually_Mean%3F

For the best look and comfort, aim for your bedside table to sit between 55 and 70 centimetres high. A good rule of thumb is to keep the tabletop about 5 to 10 centimetres lower than the top of your mattress