The golden rule for bedside tables is comfort and accessibility. Aim for a...

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

The golden rule for bedside tables is comfort and accessibility. Aim for a height that sits between 5 and 10 centimetres below the top of your mattress. Most UK beds work best with tables in the 55 to 70 centimetre range