spring sleep; deep sleep in spring
Literary noun referring to the deep, pleasant sleep associated with springtime. Often appears in the proverb 春眠暁を覚えず (shunmin akatsuki o oboezu, 'In spring one sleeps a sleep that knows no dawn').
There is a saying: 'In spring, one sleeps a sleep that knows no dawn.'
Lured by the spring weather, I savored the comfort of a spring slumber.