In my 20 years of fitting bedrooms, I’ve found the best height for a bedside...

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

In my 20 years of fitting bedrooms, I’ve found the best height for a bedside table is level with your mattress top or about 5 to 10 cm lower. This makes grabbing a glass of water effortless while you are in bed