thinking future wise... for no.3, we're thinkning of the possiblilities of moving ds or dd downstairs... has anyone got their child's bedroom downstairs... pros? cons? or is it just that this is not the usual thing to do and that it doesn't matter?.. (though well aware flat dwellers this is not an issue!!! 
why do we sleep upstairs... does this go back to hunter/praedator days and upstairs is our 'tree'???