noun
staying home and relaxing during the New Year holiday; lazing around at home over New Year's
Describes spending the New Year's holiday period idly at home, often sleeping in or relaxing, rather than going out or traveling. Common in casual conversation about holiday plans.
今年の正月は寝正月でゆっくり過ごした。
I spent this New Year's relaxing at home.
寝正月もたまにはいいものだ。
Lazing around at home during New Year's is nice once in a while.
Means to stay in bed due to illness, whereas 寝正月 is a voluntary, leisurely choice.
Compound of 寝 (ne, 'sleep') and 正月 (shōgatsu, 'New Year'), literally 'sleeping New Year'.