The boys do use their wheel (manufacturer) on a daily (nightly) basis. In the middle of the night we hear the pitter-patter of little feet walking/jogging on the wheel, luckily for us, the wheel itself is very quiet. We always thought it was Uschi walking along (trying to leave T behind?) because he is the only one we see on it during the day. However, recently we discovered that Tanji also spends time on the wheel during the dark night, no doubt trying to burn off some pent-up energy.