'it gives people an extra hour of sleep'...no it does not.
It gives you a temporary extra hour of sleep on the one day when the clock changes over. Then you lose that single hour one day next year when it changes back.
But I awake around 4am anyway
Which 4 AM did you wake up for?
Right. If you normally go to bed at 11 p.m. and get up at 7 a.m., by following the clock you would sleep in for an hour the next morning (clock says 7 a.m. but body thinks it is 8 a.m.). What most people miss is that at 11 p.m. that night, your body thinks it is midnight. According to your body you got up an hour later but also went to bed an hour later. There is no net gain.
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