For the perfect setup, aim for your bedside table to sit level with your...

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

For the perfect setup, aim for your bedside table to sit level with your mattress top or about 5 to 10 cm lower. This makes reaching for your phone or a glass of water feel natural and prevents you from knocking things over