There are several reasons for waking up and feeling pain on both sides of the buttocks, and the common reason may be a strained hip muscle. This is mainly due to doing a lot of exercise before going to bed, such as doing frequent squats or lifting weights and other exercises that can strain the hip muscles later. When the hip muscles are injured, through a period of rest, this injury will manifest itself. It is manifested as a painful phenomenon on both sides of the buttocks upon waking up. The reason for this phenomenon may also be caused by diseases such as the flu. Since diseases such as cold can lead to muscle aches and pains all over the body, it is normal to show pains on both sides of the buttocks as well. Also, waking up with pain on both sides of the buttocks may also be related to the sleeping position and the unsuitability of the bed. For example, people who are thin and weak, if the bed is too hard or the bed is not flat, it will cause pain on both sides of the buttocks due to hip compression. Can be improved by adjusting the sleeping position and adjusting the bed.