These are a few ideas for just a basic 13 year old sleepover.  DECORATIONS: Make the room your own place. Hang the normal streamers and balloons in the sleeping area and the dining area. Make them fit the theme like if you are doing a camping theme have green streamers or a 50's theme have pink streamers and black and white balloons. For different themes you can put up lights and big signs like "Camp Ground this Way" or "Mandy's Diner". If you are planning on dancing have lots of lights turned on and a good CD player nearby. If you don't have many lights just string Christmas lights around the room. They bring in a lot more color. FOOD: Just have a simple pizza or something like hotdogs and hamburgers. Maybe something to fit the theme but make sure it's not too weird. A chocolate cake or cupcakes works just fine and doesn't take too long. Have snacks supplied throughout the night. Things like chips & dip, popcorn, a few kinds of fruit and maybe cookies and anything else. Yet again you can have snack that fit the theme such as trail mix or a rootbeer float. For breakfast you can have just pancakes, waffles or cinnamon buns with fruit and sausages or bacon. GAMES: I'll just list a whole bunch of games. Truth or Dare just as long as it doesn't get gross and people aren't forced to do what they don't want to, dancing contests or just dancing, PJ fashion shows, the mummy game where you wrap a person up in toilet paper, light as a feather ,ghost stories, do bloody Mary or candy man in the bathroom ,makeovers are always fun, sardines, if you only have a few people playing video games is fun as long as no one is left out. CRAFTS: Make lip gloss, there are recipe on the internet or buy a kit, you can also, tie-dye handkerchiefs, bead necklaces or bracelets, you can melt and shape soap and used it before or after makeovers. PARTY FAVORS: a bag of jelly beans, gum,a baloon, sunglasses, mini flashlights, a bandana, toy whistle, lip gloss, mini fingernail polish, a small bracelet, keychains, a gel pen and black mini notebook, little lotion bottle, ring pop, lollipops and other little toys and candy work well. OTHER: It's always good to have a movie and a time for people to start going to sleep even though me and my friends stayed up until about 6:00am. Make your b-day special and I hope this helped.