1. Your digestion is out of whack
Lying down or sitting around most of the day is a great way to stop up your bowels and cause constipation.
2. Stiffness of joints
The synovial fluid present in your knees, shoulders and ankles helps in the joint movement. However, lack of movement throughout the day causes this fluid production to slow down.
This is the reason of the creaky feeling you might experience the first thing you wake up in the morning.