That our post-puberty Dennis the Menace appears to be lost in such deep slumber seems only understandable.
"the time of life in which the two sexes begin first to be acquainted" [Johnson], late 14c., from Old French puberté and directly from Latin pubertatem (nominative pubertas) "age of maturity, manhood," from pubes (genitive pubertis) "adult, full-grown, manly." Related: Puberal; pubertal.
puberty pu·ber·ty (pyōō'bər-tē)
The stage of adolescence in which an individual becomes physiologically capable of sexual reproduction.