## 1 Introduction
According to the results of the studies, the evaluation method performed with body pressure distributions is the most effective method [3; 14]. This may be because body pressure distribution can respond quickly to materials used, support arrangements, human weight, or lying positions. Long-term high pressure applied to specific portions of the human body has been demonstrated in studies to have an effect on the human central nervous, blood circulation, and endocrine systems [15; 16; 17]. Furthermore, due to variances in subcutaneous tissue and tissue architecture, certain areas of the human body are extremely sensitive to pressure. In terms of ergonomics, the human body's pressure perception can be separated into dull and sensitive sections. Dull portions can handle higher pressures, but sensitive parts can only feel comfortable at low pressures. As a result, one of the primary goals in choosing a pillow should be to reduce pressure on sensitive points [18; 19]. Although it has been claimed that the pillow's primary function is to optimize head and neck posture, there has been little research on its effectiveness in terms of head and neck posture [20]. A third of our lives are spent sleeping, during which the spine is out of our cognitive control. Pillows, as a result, serve a crucial function in maintaining proper head and neck posture and can alter muscle activity [21]. The position of the head and neck has a significant impact on sleep quality. It has been noted that while sleeping, cervical control decreases, putting undue strain on spinal tissues. During this time, symptoms, such as neck and shoulder pain, tension headaches, and muscle stiffness, diminish sleep quality [22]. As a result, there is an urgent need to research how alternative pillow materials might properly support the cervical spine, hence reducing neck pain and improving sleep quality [23]. Forward head posture (FHP) is the anterior cervical spine alignment; it is also known as \"text neck,\" \"scholar's neck,\" \"wearies neck,\" and \"reading neck.\" One of the most -frequent postural issues is FHP, which is a bad habitual cervical posture. FHP is significantly linked to a variety of musculoskeletal diseases, including neck pain, suboccipital trigger points, headache, restricted neck movement, and functional impairment of the neck and thorax. A lack of established back muscle strength as well as nutritional deficiencies, such as calcium deficiency, all contribute to this postural condition. Age is associated with decreased cervical ROM, thoracic kyphosis with greater cervical flexion, and forward head posture with larger deficits in cervical rotation and flexion ROM [24]. This sagittal plane cervical spine dislocation is distinguished by the position of the head anterior to the vertical line running through the lateral malleolus. This postural aberration is distinguished by an increase in upper cervical extension and lower cervical flexion, which might result in compensatory responses, such as thoracic kyphosis and rounded shoulders. These structural changes result in muscular tension imbalances, altered muscle strength and morphology, diminished cervical spine and thorax mobility and function, and altered muscle recruitment around the neck and back. These biomechanical changes could affect the stresses on the neck and back musculoskeletal structure during functional activity and various resting positions, including sleeping postures [25]. Scientific evidence suggests head postural changes affect the development and persistence of neck pain [26]. [PERSON] et al. argued pillows or mattresses specifically designed for people with FHP could reduce muscle fatigue and potential musculoskeletal pain in patients with FHP [25]; therefore, it should be one of the main factors in choosing an ergonomically correct pillow. In addition, the cervical muscles play an important role in the control of neck posture. During sleep, the ideal pillow should support and maintain good spinal alignment while minimizing biological stress on the musculoskeletal system.