For the best look and easy access, your bedside table should sit 5-10 cm below...

https://www.foxtrot-bookmarks.win/in-my-twenty-years-of-fitting-bedrooms-i-ve-found-the-golden-rule-is-keeping

For the best look and easy access, your bedside table should sit 5-10 cm below the top of your mattress. This setup feels natural when you reach for a glass of water or your phone at night. Most standard tables in the UK range from 55-70 cm high