Cot vs. double bed

Mommy and daddy put me back in my cot over the weekend. I didn't really understand why they were doing it at first, i really liked sleeping with them and plus i could pull mommy's hair and hit daddy on the face when i wanted them to wake up and play.. it was brilliant! but after spending some time in my cot i'm sleeping really well and mommy and daddy are too, so i guess it's a good thing really.