Elena,
early to bed and early to rise makes a man healthy, wealthy and wise:-E)
(Though compare Wikipedia:
"The bias toward early morning can also adversely affect adolescents in particular. Teenagers tend to require at least 9 full hours of sleep each night,[6] and changes to the endocrine system during puberty shift the natural wake time later in the morning.[7] Enforcing early start times despite this can have negative effects on mood, academic performance, and social skills.[8][9]")