Here is the maths:
1. Forward 1 hr to get more day light but lose 1 hr of yr life.
At midinght, 12, you adjust yr clock to 1 am. You imagine it is 1am now but yr body time is still at 12. Where is the 60mins of yr body time clock that was supposed to go through? So the 60 mins is the imagine time, correct?
U need 8 hrs of sleep, right!.
U sleep at the imagine time 1am, which means U sleep for 7 hrs only.
U lose your body time to the imagine time, lose 1 hr of body sleep time.
2. Wind back 1 hr, from 12am to 11 pm.
Yr body time is at 12 and u are told to wind back to 11pm which means your body time has to go through another 60mins again to restart at 11pm. In this case you lose 1hr of body time already.
U need 8hrs of sleep. You go to sleep at the imagine time 11am (which is yr body 12am time.
Again you lose 1 hr of yr body time to the imagine time.
Therefore, every 1/2 a year, your lose 1hr of yr body time to the imgine time and as such u lose 2 hrs in a year.
Go figure out how the maths works?
Body time and imagine time is 2 different object time...