My family and I keep a similar schedule. I'm up at about 2:30 am for studying and I head off to work to start at 05:30 am. My wife and kids are up at 5:30 am to start their day and our days end in the evening. We've got a pretty easy weekend if we get all our chores completed. Once my kids are out of the house, I'll be sleeping in late. Personally, you get more done in a longer day. And you have more time to play at the end of the week.
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RE: Cold exposure & 4 AM waking up experiment