For the best look and comfort, aim for your nightstand to sit level with your...

https://jasperotbu571.iamarrows.com/the-ergonomic-guide-optimising-nightstand-height-for-limited-shoulder-mobility

For the best look and comfort, aim for your nightstand to sit level with your mattress top or just 5 to 10 centimetres below it. This makes reaching for your phone or a glass of water effortless while you are in bed