[NTG-context] Blank at beginning of page

Hi, being new to ConTeXt I'd have loads of questions but I'd like to start with what puzzles me most: any \blank[] command that happens to be at the beginning of a page seems to be ignored. For instance in a document as follows \showframe \starttext \blank[5*big] Some text. \stoptext the string "Some text." will be placed on the very top of the text field, regardless of what \blank[]s precede it. I read a good deal of the documentation but couldn't make out the cause nor a workaround. Right now I even consider to put headings inside a float or something like that in order to make their [before=\blank[someblank]] option effective. Thanks in advance for any advice Philipp