When My Siblings Think I'm Sleeping Over at Theirs

So here's the thing...I've been kind of playing a game with my siblings. You see, we all have our own rooms and stuff, but lately, I keep pretending like I sleep over at one or the other every night. It started as a prank on my older sister because she was always telling me to clean up more...but then it turned into this weird routine where everyone just assumes I'm sleeping elsewhere when really I've stayed in my own room all along. Now, they leave little treats and notes for me thinking I'll be there! But every time, I wake up to a cozy surprise, and I get this silly smile on my face knowing no one knows the truth...It's been going on for weeks now, and it feels like such an inside joke between us. I just wonder if anyone has ever noticed something strange or if they're completely clueless? ...I mean, maybe they have their own little secrets too...