Oura Ring sleep score dipped this winter but spring may improve it

The author's Oura Ring showed lower average sleep scores in October–December, and experts report reduced daylight, warmer bedroom temperatures and less daytime activity can explain poorer winter sleep; longer, brighter spring days are reported to help reset sleep timing.

My Oura Ring quarterly reports showed October, November and December were the weakest months for sleep this year, with average sleep scores dipping. I also noticed it took longer to fall asleep on many nights and my perceived sleep quality felt lower. Experts cited seasonal factors — reduced morning light, more time indoors, holiday alcohol and warmer bedroom temperatures — as contributors to poorer winter sleep. With spring approaching, conditions such as longer daylight and cooler nights are reported to shift in ways that support more regular sleep timing. Key points: - The author's device data showed the lowest average sleep scores in October through December, with scores climbing again in the new year. - Experts say reduced morning light in winter can shift circadian timing and affect hormones like melatonin and serotonin, which influence sleep and wakefulness. - Lifestyle changes common in winter—more sedentary time, increased evening screen use and higher holiday alcohol intake—are reported to lower sleep pressure and reduce overnight recovery metrics such as heart rate variability. - Higher indoor bedroom temperatures during winter were reported to make it harder to reach deep sleep; one cited study notes an ideal sleep temperature range near 65–70°F (18–21°C). Summary: Winter conditions were reported to coincide with lower sleep scores and slower sleep onset for the author, and experts link this to reduced daylight, altered activity patterns, seasonal changes in light-driven hormones, holiday-related behaviors and warmer bedrooms. The author's scores were rising again in the new year, and experts report that longer, brighter spring days, more outdoor activity and milder night temperatures commonly help realign circadian timing and support improved sleep quality.