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

https://amumreviews.co.uk/should-bedside-tables-be-higher-than-the-bed/

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