Another physiological difference lies in circadian rhythms and sleep architecture. Females generally have a slightly shorter circadian rhythm and are more likely to be "morning larks," preferring to go to bed and wake up earlier. Men, on the other hand, more frequently display a "night owl" chronotype. When partners with different natural internal clocks share a bed, one person is inevitably forced to compromise their optimal sleep timing. Since women are generally more affected by chronic sleep deprivation, being forced to stay up later or deal with a restless partner who is still awake or coming to bed late can be more disruptive to their overall rest-wake cycle.
