Why is it.........

that your bed NEVER feels the same as when you FIRST make it up with clean sheets??

I mean, you can use the same sheet spray, the same blankets that hadn't been washed when you put the clean sheets on, and you may have been so exhausted, you never moved an INCH from where you landed, but the next day, the sheets are 100% different and NOT the same, even if you make it up exactly like you did the day before............

Can ANYBODY explain this phenomemon?