For a balanced look, your bedside table should ideally sit level with the top...

https://riveraeku966.almoheet-travel.com/the-goldilocks-guide-how-to-achieve-perfect-bedside-table-height

For a balanced look, your bedside table should ideally sit level with the top of your mattress or just 5 to 10 cm below it. This makes reaching for your phone or a glass of water effortless while you are in bed