Cyril Haearn wrote:I would have had to get up at 04:30 and I know (?) it would have damaged my health, although I don't go out late to the pub in the evenings and I like to go to bed early, one might have thought the body could adapt but it was clear, I will not try it
Regular hours don't damage your health.
It's just the equivalent of moving east a few hours, nobody over there complains of ill health through getting up early.