Here my bed is made for two and there's nothing I can do
So tell me something I don't know
If my head is full you, is there nothing I can do?
Must we all march in two by two by two?
Cerys’ bed being “made for two” is a pun on the saying, “you’ve made your bed now sleep in it”. She’s in a relationship, and so naturally she requires a double bed, but she feels that she’s trapped with and by her other half and must now face the consequences.