不倒單  / bù dǎo dān /
Never Lying Down 
Category:
Buddhist Terminology 
Description:
長行不倒單,坐不倚床,精持戒律之感應不勝枚舉。
To constantly practice never lying down, sitting without reclining on the bed;
The miraculous responses of diligently upholding the precepts are too numerous to name.
References:
星雲大師全集【書法類】中華文化佛教名詞 名相 The Complete Works of Venerable Master Hsing Yun: Calligraphy-Terminology 
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