A recent study has revealed that couples who go to bed at the same time enjoy better sleep quality compared to those with mismatched bedtimes. The research, conducted by Seoul National University and published in BJPsych Open, analyzed sleep patterns of 859 married couples over eight years.
Impact of Different Bedtimes
The study found that when one partner comes to bed while the other is still trying to fall asleep, it can take up to 63 minutes to doze off—more than double the average for couples who share a bedtime. Women are particularly affected, taking about six minutes longer each year to fall asleep if their partner has a later bedtime.
The Fragile Sleep Window
Professor Ki Woong Kim, senior author, explained that the problem arises during the 'fragile sleep window'—the first 20 to 30 minutes before sleep is established. During this period, the brain is highly reactive to light, sound, and movement, and a partner getting into bed can reset the sleep onset process.
Emotional Connection and Sleep
Couples who go to bed together may feel emotionally closer, while different bedtimes can lead to reduced connection, stress, and poorer sleep. Even if one partner is already asleep, mismatched schedules may affect relationship satisfaction.
Sleep Quality and Long-Term Effects
People whose partner came to bed while they were drifting off spent about 14% of the night awake, compared to less than 6% for those sharing a bedtime. Night owls who joined their sleeping partner took only slightly longer to fall asleep but reported poorer sleep quality overall. The long-term effects are more pronounced in women, with increasing sleep onset latency over the years.
Professor Kim suggests that going to bed at the same time is a simple, non-pharmaceutical strategy to improve sleep, especially for older adults concerned about their rest.
