In ESA's public journal for the Mars500 project, Knickel wrote on April 7: "We all slept very well during our first nights, not waking up for anything, although in the crew quarters you can actually hear all sounds from anywhere in the module, even if the doors are closed. I realised that in order to fit in the bed I have to open the door of the wardrobe behind my bed since both the bed and me are exactly 1.85 m long. But while sleeping you need a little more space than your usual body height because of the feet not being in a 90 degree angle to the legs, as when standing, so I would need 1.95 m, which is only possible if I open the wardrobe behind the bed and sleep with my head between my books and folders."
For keeping up muscle tone, Knickel wrote: "Cyrille and I are both using a device that stimulates the muscles by sending electricity through them with a regular frequency. This is new for us and quite a funny feeling, especially since we are wearing our devices for three hours in a row."