Every night. Pre TKR, I would fall asleep on my right side with a pillow between my knees, and then at some point in the night I would roll over to the left side, didn't need the pillow on that side. I'm a "lazy" sleeper, don't normally do much moving once I'm asleep. Since the surgery, I try lying on my right side, but cannot usually get the pillow in the right position to keep my operated knee comfortable, so end up sleeping on the left side most of the night. This causes me to wake up with neck pain on that side and sometimes a headache, have some cervical disk arthritis. I've been drinking more, so I'm up more, also need to refill my ice machine sometime in the night. If I'm lucky, the call of the bathroom will coincide with my next scheduled dose of pain med, and more ice in the machine. Other nights, I toss and turn all night. I've offered to move into a guest bedroom across the hall, but my husband says it doesn't bother him.