Sleep Compatibility and Chronotype Differences
Chronotype refers to individual differences in circadian rhythm timing, with about 50% determined by genetics. Conscientiousness correlates with morningness while openness relates to eveningness (Tsaousis, 2010). Larson et al. (1991) demonstrated that chronotype-matched couples report higher marital satisfaction than mismatched pairs. Gordon & Chen (2014) showed that poor sleep reduces gratitude and increases hostility toward partners. Co-sleeping provides psychological security but may reduce objective sleep quality. Effective strategies for chronotype mismatch include maximizing overlap time, sharing bedtime rituals, weekend synchronization, and light environment adjustments rather than forcing one partner to change their natural rhythm.