photos taken in your typical sleepwear (and if you sleep nude, that's fine too),
either taken on your bed or in your bedroom.
Remember to highlight your curves as much as possible -- so if you sleep in something super-baggy, maybe pull it snug around your form, or pose in such a way that your curves can be seen. ;-)
DON'T FORGET TO TAG your theme entries with 'pajama party'!!!!!