Many SLEEP 2013 add-on sessions have already sold-out; have you purchased your tickets yet? In order to attend meet the professor sessions, lunch debates or postgraduate courses, you must be registered for the SLEEP 2013 general session. The APSS does not offer registration to attend only add-on sessions. Seating is limited and sold on a first-come, first-served basis. The APSS does not maintain waiting lists for add-on sessions. Visit the SLEEP 2013 Snew-Out Sessions page for up-to-date lists of sold-out sessions and then visit the SLEEP 2013 registration page to secure your space at SLEEP 2013!