How tall should a bedside table be? Raise the bed and see

The best bedside table is usually level with the top of your mattress, or at most a few centimetres higher. Too high and you reach up and over; too low and you bend out of bed for your glass.

Set your mattress height, drag the table up and down, and watch the gap and the verdict. Then measure your own bed and see whether you need a new table at all.