For the perfect bedroom balance, your nightstand should sit level with the top...

https://www.blaze-bookmarks.win/ideally-your-bedside-table-should-sit-5-10-cm-below-the-top-of-your-mattress

For the perfect bedroom balance, your nightstand should sit level with the top of your mattress or ideally 5-10 cm lower. Most standard UK beds pair well with tables between 55-70 cm high