This depends on where you have lymphedema, as it’s important to position yourself in such a way that the lymph can drain. So, if your arm is affected, keep it comfortably elevated (ensuring that it stays below shoulder-height) by resting it on a pillow. If your leg is affected, you’ll either want to recline with your legs up, or sit with your leg up on a chair or ottoman, ensuring that you are supporting your knee with a cushion or pillow. And avoid sitting with your legs crossed. Finally, if you have lymphedema in your head/neck, you should sleep with your head elevated to help the fluid drain. You can do this either by sleeping with a foam wedge or a special pillow, or by elevating the head of the bed. In any case, you should avoid being stationary for long periods of time. It’s a good idea to get up and move around at least once an hour if you are able to do so.