User talk:Javier Barranco
Hi -- the classification of stage 4 has been dropped, regardless of what Kaplan says (it often takes textbooks a while to catch up). This topic has been discussed before at Talk:Sleep#discontinuing stage 4?, and it comes up every so often in article edits. So, I'm going to undo your edits -- if you disagree with this, could you please open a discussion at Talk:Sleep and explain your reasons? Regards, Looie496 (talk) 17:29, 4 January 2010 (UTC)