姿勢變換是睡眠狀態中調節體溫及血液循環的重要動作，不同的睡眠姿勢需要不同的身體支撐，避免壓力集中或是不當的壓力分佈造成麻痺及血液循環不良等情形發生，進而降低睡眠品質，而床墊是姿勢變換過程中之身體部位直接接觸的寢具，仰臥與側臥為睡眠中佔大部分時間的姿勢，且睡眠過程人體並非靜止，伴隨著無數次的姿勢變換，仰臥與側臥姿勢的需求大不相同，只符合一種姿勢的寢具可能會使其他睡眠姿勢產生不適感，因此一款同時符合側睡及仰睡需求之床墊，減少寢具對不同睡眠姿勢產生的睡眠干擾，能提升使用者的睡眠品質。
本研究將從姿勢變換的角度由文獻探討、睡眠觀察及使用者訪談中分析睡眠姿勢對身體部位產生的影響，藉由焦點族群法根據仰臥與側臥的需求以及變換姿勢所造成的影響歸納出設計準則並發展初步構想;接著進行co-design細節設計，針對側躺時的手臂螺旋溝、膝蓋腳踝以及仰姿腓腸肌等部位發展可行之氣囊床墊型態，並由參與者主觀評估各部位氣囊之壓力及舒適程度，最終於各部位挑選出一種型態組合成最終設計；針對側躺及仰躺判斷依據參考前期研究之肢體分佈，搭配壓力分佈圖挑選各姿勢之壓力固定集中點，並將此設定為該姿勢壓力感測器位置;最終完成一款根據壓力分佈符合仰躺及側躺的氣囊床墊，夜間睡眠品質使用腕動儀進行評估。
睡眠品質比較設計氣囊床墊及市售記憶眠床墊，客觀評估的腕動儀數據中，氣囊床墊於入睡時間及睡眠效率有較佳表現，而其中睡眠效率之原始數據無顯著差異，然而除去前三十分鐘之數據後，睡眠效率直則有顯著差異，顯示在沒有淺眠的影響下，新型氣囊床墊相較於市售記憶床墊較能提供較佳睡眠效率，氣囊充氣之效果減少睡眠時壓力集中於固定點過久，減少壓力產生末梢麻痺之情形，進而維持較佳睡眠品質。

When people changing their sleep positions, pressure transferred from trunk to the underneath arm will harm their shoulder, reduce sleep quality and even enhance shoulder pain. However, position changing is also a mechanism to control body thermal comfort and blood flow, and we always change to lateral position unconsciously. Since lateral position and supine position are the two dominant positions in sleeping time, the two positions should be took into consideration in mattress design.
In this study, there would be a mattress to be developed based on supine and lateral positions. To avoid pressure palsy, the location of nerves and vessels should be prevented from long-term pressure. The location of spiral groove, knees and ankles would be compressed in lateral position for the peak pressure of joints and arm; the location of calf would be prevented from pressure because of the calf vein and sural nerve inside; the design processes would be developed in focus group and co-design workshop. In the focus group, several sleep factors were sorted into categories, and the participants would generate rough concepts based on the strategies in the discussion, and then, the detail design would be developed in co-design workshop. The air cushion would be chosen for the function of pressure reduced, and it could be controlled by valves to provide different contact area. Continuously, the locations of air cushions were defined according to the outcome of previous work, and the strategies and design features for every locations would be evaluated. The final air cushion mattress would be built for the evaluation of sleep quality.
In the sleep quality measurement, for objective sleep quality measurement, there were better sleep latency and sleep efficiency with air cushion mattress, and there was no significant different difference in every sleep parameters. However, without the first 30 minutes, there would be significant difference in sleep efficiency. Compared to memory foam mattress, the result would indicate that air cushion mattress could provide better sleep quality without the disturbance of light sleep, and less pressure at a local point than memory foam mattress would reduce pressure palsy during sleep time, and thus, the new design could improve sleep quality.

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