A study on racial differences in circadian rhythms found that European-Americans had longer circadian periods which reduce jet lag and make it easier to work night shifts and sleep during the day after night work, compared to African-Americans who have shorter circadian periods.

See the source article by following the link below:
A study on racial differences in circadian rhythms found that European-Americans had longer circadian periods which reduce jet lag and make it easier to work night shifts and sleep during the day after night work, compared to African-Americans who have shorter circadian periods.