For the best look and comfort, aim for your bedside table to sit roughly 5-10...

https://weekly-wiki.win/index.php/Why_does_my_bedside_table_look_out_of_proportion_with_my_bed%3F

For the best look and comfort, aim for your bedside table to sit roughly 5-10 cm below the top of your mattress. This keeps your lamp and water within easy reach while you are in bed