Jay Sean is likely to sleep between 6 a.m. and 1 p.m..
Jay Sean - Jay sean/ jay sheezy/ jay shizzle/ the shizzle/ jay schnitzel (ok maybe not the last one) http://www.jaysean.com
Jay Sean is located in London, UK (London time zone). If the sleeping schedule doesn't appear right, maybe @jaysean hasn't specified the correct timezone in their Twitter profile.
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