For a comfortable bedroom, your nightstand should sit level with the top of...
https://www.ready-bookmarks.win/aiming-for-a-nightstand-that-sits-5-to-10-cm-below-your-mattress-top-is-the
For a comfortable bedroom, your nightstand should sit level with the top of your mattress or up to 10 centimetres below it. This makes reaching for your phone or a glass of water effortless