Is loimm for sáith súan i fat.

(is * mouthful * on * surfeit * sleeping * in * length)

Sleeping too long is like having one drink too many.

Too much sleep can leave you with a hangover.

A proverbial saying incorporated into a poem that Emer recites to Cú Chulainn in “Serglige Con Culainn”, when he won’t get out of bed.