Someone may have come up with that theory, but 10 years ago there was an analysis that suggested he slept between 6am and 11am GMT, which fits best with a US timezone.[0]

There is other timestamp evidence linking him to the US, but a recent analysis suggests that the totality of the data (including Satoshi's use of British/Commonwealth spelling, vernacular, and date format) indicate he was based in London or the UK.[1]

[0] https://bitcointalk.org/index.php?topic=37743.0

[1] https://news.bitcoin.com/new-research-suggests-satoshi-nakam...