noun, noun or participle which takes 'suru', intransitive verb
sleeping a long time; oversleeping
Refers to sleeping for an extended period, often with a nuance of sleeping in or oversleeping. Can be used as a noun or with する as an intransitive verb.
休日はつい長寝してしまう。
On holidays I end up oversleeping.
長寝は体に良くないと言われる
They say sleeping too long is bad for your health.