Yaaawwwn...
Artist's commentary
Weakly Disgusting Remirya 207
"In spring, one sleeps like...what was it, again...zzz...." The stock phrase is 春眠暁を覚えず (Shunmin akatsuki wo oboezu, lit. "The sleep of spring knows no dawn"), meaning "In spring, one sleeps like a log", because the temperature is perfect for making one oversleep.