The golden rule for bedside tables is comfort and reach. Aim for a height that...

https://lilyluxemaids.com/the-golden-ratio-of-bedside-comfort-matching-your-mattress-to-a-60-63-cm-nightstand/

The golden rule for bedside tables is comfort and reach. Aim for a height that sits between 5 to 10 centimetres below your mattress top. This keeps your phone or book within easy reach without you having to stretch or strain