I tend to browse myself to sleep and on about 3-4 occasions I have noticed that your website goes down every night at midnight for atleast a few minutes. I get a screen that has a logo for "Magento" with the error message "There has been an error processing your request".


Is this normal?

It is--  it's when we do any backups and deal with maintenance issues to make sure there's no down time during the day.   It shouldn't be down for more than a few minutes though.