But a most deep mechanisms also having as inside chronometer, which works a dont depends from situation.

 And this is evidenced by a famous experiment, German Physiologist Ashoff. And on 1962 y  .he put an own son  in underground  bunker ,  without a light, and sounds. And  they are lived oriented on an own inside  needs: gone in bed, stayed activity  ,  and turned in and out a light, when they are want.  All time used a check for cycles a sleep -wakefulness, body temperature and other stats.  Experiment showed, that in human having inside, inborn  circadian rhythm  as by Latin circa dies -about a day.This rhythm regulates a sleep time and wake up in any conditions. Inside chronometer is lags behind from a real time  for hour.

But what are scientists fixing for norm, and what  as  for situation? By a doctor biomedical holding Atlas BY  Zegulina, if you are going in bed  in 10-11 p. and waking up on 9-10 am, thus  a  mean   different variant for norm. And separation for owls and larks here is  conditional , as a most often a domestic. And here in humans are standard variants of genes, involved  in circadian mechanisms. And what is mean, that organism in a condition to displaces regime in different sides and keep a comfort to live. Usually for this a need to manufacture a habit, as a few times you need to go in bed a earlier/later, and wake up is on a appropriating time. And later for you will stop give you inconveniences. And Japans are sure,that owls not need to cure and retrain , provoking a depression. A need to find worthy using in a community.  And if a genetical owl a restore life in such regime as find a work, relation create these  unfavourable changes  for organism are not happening, and not needing a cure. And diagnosis,needing for medicaments using are putting, if  deviations for chronotype are negatively affecting on your sleep quality and daily activity, and not allow to  live a   normally, and work. All discussions on a theme How a bad to wake up late  is need to translate on a language of gene mechanisms.  Very sad ,that chronotypes are not checking in our life worthy .And for peoples ,which are waking up early, and working easy. And in rhythm for larks works all regional institutions. These are schools, shops, hospitals, pharmacy, posts, banks.But in these  places are owls too works.And  by an opinions of lots of specialists here and hiding a base reason , that lots of modern peoples are often stressing, causing an often  pressures.And a how to correct this, never still not  though up.But we are trying.