Are You a Morning Lark or a Night Owl?
How your chronotype affects your most intimate relationship.
Posted May 28, 2018
“Birds of a feather flock together.” Research in psychology has repeatedly shown that when it comes to interpersonal attraction, this old adage is true far more often than not. Especially for long-term intimate relationships, we tend to prefer partners who come from the same ethnic or racial group, religious tradition, socio-economic status, and level of education. And in married couples, we see far greater similarities in personality than would be expected by chance.
Selecting a mate who’s similar to yourself is known as assortative mating. Psychologists have found all kinds of traits that are correlated between partners, yielding plenty of evidence for assortative mating. And this goes for both physical traits, such as the distance between the eyes, as well as for psychological traits, such as personality. What’s more, assortative mating isn’t a uniquely human phenomenon either. Throughout the animal kingdom, individuals seek out mates who are similar to themselves, whether that be in terms of size, strength, or rank in the pecking order.
One personality variable that has not been explored in depth within the context of intimate relationships is chronotype. This is an individual preference for a particular time of day. On the one hand, morning “larks” prefer getting up and going to bed early, and they’re at their peak performance early in the day. On the other hand, night “owls” like sleeping in and staying up late, and they don’t perform well until afternoon or evening.
Like other personality traits, chronotype extends along a continuum, with a few extremes at each end, and most people clustering in the middle. If you don’t have a preference for morning, afternoon, or evening, then you’re a neutral chronotype. But if you’re a morning lark or a night owl, you definitely know it. And you’ve probably got a pretty good idea of your partner’s chronotype as well.
To some extent, chronotype can be shaped by circumstances. If you’re a baker, you’ve got to be a morning lark, since your goods have to be ready to sell by other people’s breakfast time. And if you’re a jazz saxophonist, you’d better be a night owl, because that’s when all the gigs are.
But there’s also a biological component to chronotype. For one thing, chronotype changes with age. Young children tend to be morning larks, but they shift to night owl after puberty, only to trend back toward a morning preference by later adulthood. There’s even a slight gender difference, with females tending more toward morning-type and males toward evening-type.
Even the timing of bodily processes is different in morning-types and evening-types. For instance, body temperature cycles through a daily rhythm, but it peaks an hour earlier for larks than it does for owls. (Yes, researchers really do call morning-types “larks” and evening-types “owls.”)
Overall, health outcomes are better for larks than owls. Morning-types experience fewer health issues, less incidence of depression, and report higher levels of subjective well-being. So apparently there’s some truth to the old saying: “Early to bed and early to rise, makes a man healthy, wealthy, and wise.”
Chronotype even predicts a person’s attitudes toward sexuality. Both male and female evening-types are more likely to approve of — and engage in — short-term sexual relationships, whereas morning-types tend to prefer long-term relationships. This makes intuitive sense. After all, if you want to find casual sex partners, you’ve got to hang around bars late at night, because that’s where all the short-term maters are. It’s much, much harder to find a hook-up at a Starbuck’s at six in the morning.
Prior research has shown that couples tend to select partners who are similar to them in chronotype — larks tend to marry larks, and owls tend to wed owls. But of course most people are in the middle range, where small differences in time preferences could possibly lead to conflict. In particular, differences in preferred time for engaging in sex could lead to dissatisfaction in lark-owl couples. This is the issue that Polish psychologist Paulina Jocz and her colleagues at the University of Warsaw investigated in a recently published study.
Specifically, Jocz and colleagues asked three questions:
- Does a person’s chronotype extend to a preferred time for having sex?
- Does a difference in chronotype between partners lead to a decrease in sexual and relationship satisfaction?
- Are morning-types happier in their long-term relationships compared with evening-types?
To answer these questions, the researchers recruited 91 heterosexual couples who’d been sexually active in their current relationship for at least six months. Each participant individually responded to a set of questions without being able to compare answers with their partner. The questionnaire included items measuring:
- Morning or evening preference for various daily activities
- Sexual satisfaction
- Relationship satisfaction
- Preferred time of day for sex
- Actual time of day when they usually had sex
The results paint an interesting picture of the intimate lives of other people. First of all, and to no surprise, sexual satisfaction and relationship satisfaction were strongly correlated for both males and females. Furthermore, both partners generally agreed on their level of sexual and relationship satisfaction. These findings concur with plenty of other research showing that the quality and quantity of sex are good barometers of the emotional state of the relationship. Happy couples just have more and better sex than unhappy couples.
In contrast to previous research, no evidence for assortative mating in terms of preferred time for sex was found. Rather, differences tended to split along gender lines. Male larks preferred having sex in the morning, while male owls preferred doing it in the evening. But women, whether morning-type or evening-type, preferred having sex right before going to sleep.
Jocz and colleagues acknowledge that these two most preferred times for sex — early in the morning and late in the evening — could also be shaped by people’s daily work schedules. Most of us work during the day, so mornings and evenings are the only times that we usually spend with our partners. Interesting, there was also a small peak in sexual interest in mid-afternoon, but only for the evening-type males. Apparently, night owls like to get a little nookie in the middle of the day as well as later that night. Make of that what you will.
And what about the morning men? Even though they wanted to have sex in the morning, their partners almost always preferred sex at night. As a result, the timing of sexual activity was dictated by the female’s preference, not that of the male. (“We only have sex when she wants to have sex.”) Although this mismatch in preferred time for sex did have an impact on relationship satisfaction, it didn’t affect the frequency of sex. Apparently, “lark” husbands accommodate to their “owl” wives’ desires. In other words, they accept that sex on her schedule is better than no sex at all.
The third hypothesis proposed that morning-types would be more satisfied with their relationships, because in general they report higher levels of subjective well-being than do evening types. Again, the data split along gender lines. Morning-type males did not report greater relationship satisfaction than evening-type males, as they had been expected to. The researchers speculated that the morning-type males were likely frustrated, because they weren’t getting sex when they wanted it. However, morning-type females did say they were happier with their relationships than evening females, in line with the hypothesis.
Differences in a couple’s chronotypes can lead to sexual and relationship problems. The researchers suggest that marriage counselors take into account morning and evening preferences when working with troubled couples. But it would be a good idea for all couples to carefully consider their own and their partner’s chronotype.
If you’re a “lark” husband, you should try to negotiate at least an occasional morning romp in the hay. Always giving in to your partner’s preferences will only lead to resentment, affecting the relationship satisfaction of both spouses. And ladies, if your husband is a “lark,” let him have it when he wants at least some of the time: for example on the weekend, when you don’t have to go work. You’ll both be happier for it.
Jocz, P., Stolarski, M., & Jankowski, K. S. (2018). Similarity in chronotype and preferred time for sex and its role in relationship quality and sexual satisfaction. Frontiers in Psychology, 9, 443.