For the most comfortable feel, aim for your bedside table to sit 5 to 10...

https://brooksfznx367.theburnward.com/the-definitive-guide-to-nightstand-height-for-storage-platform-beds

For the most comfortable feel, aim for your bedside table to sit 5 to 10 centimetres below the top of your mattress. This makes reaching for a glass of water or your phone effortless while you are in bed