I'm the same, yet one has to be careful about extrapolating from personal experience. Lots of people here recommend exercising before work, yet for me it leaves

I'm the same, yet one has to be careful about extrapolating from personal experience. Lots of people here recommend exercising before work, yet for me it leaves me tired and in a bad mood, and kills my productivity. I know people who have quite irregular "natural" sleeping periods, and furthermore when they sleep 10-12hrs, they feel ill the whole day. They use the alarm clock to ensure a more regular period, and feel better for it.