Just ordered a divan bed - never had one before, now looking at headboards to go with it. We have limited headroom due to sloping ceilings - so I need to be careful about the height of the headboard. Where would your headboard normally sit - does it start from the top of the base or the top of the mattress? And if it has struts (rather than wall fixings), does it matter how long they are? Are divans all the same standard height? Arrgh!! Can anyone help?