Personally I think you guys should get down and dirty in the same bed as her little sis, while she sleeps.... She'll be traumatized and I can bet you she'll never invade yer "alone" time ever again. heh.
oh and "shizzle dizzle" learn to spell..1st it's way TOO...and THEIR not There...gawd..and THE ...come on now seriously...and one last thing...what's wrong with being sad all the time...you don't know if something really bad happened to them or not && what's wrong with being sad..u can ne sad too! so leave them alone...what did they ever do to you??