For me it definitely varies by season. I don't use an alarm clock and I go to be... | Hacker News

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		adrianN on April 17, 2014 \| parent \| context \| favorite \| on: How to Avoid Sleep Debt For me it definitely varies by season. I don't use an alarm clock and I go to bed roughly at the same time every day (+- an hour at the very most). In summer I wake up around six, in winter I sleep until nearly eight.

kijin on April 17, 2014 [–]

If you're not using an alarm clock, then it's probably sunlight (or warmth) that wakes you up. The sun rises earlier in the summer.

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