床母 chhn̂g-bó  A bed deity in Taiwanese folk religion, who protects children and ensures they grow up safely.

Found this in Li Ang’s 《路邊甘蔗眾人啃》 (Everybody nibbles on the sugar cane at the side of the road), the context is below:

陳俊英還會不時與她作這類的談說：

「我小時候聽過床母，都說床母是神。」他回復了一貫的平和：「真好，睡的眠床也有神，我便總感覺有人抱著我睡，很安全、很被照顧著。」

Chen Junying would say this kind of thing from time to time:

“When I was little I heard about the bed deity, with people saying that it was a god.” He recovered his normal composure: “It was great, even the bed I slept in had a god, I always felt that someone was holding me while I slept, I felt really safe, like someone was looking after me.”

Quick update: the book is as sexually explicit as the 18+ label suggests.