This is the perfect temperature to increase sleep, decrease stroke risk: experts
All you need to know (unless you like clickbait ):
The findings, published in the journal Science of the Total Environment, revealed that sleep is most efficient and restful for older adults when nighttime ambient temperatures range from 68 degrees Fahrenheit to 77 degrees.
At the link, you only get the abstact, which should suffice.
Highlights
• Bedroom ambient temperature was associated with sleep in older adults.
• These associations were independent of other environmental and personal factors.
• Sleep quality was optimal between 20 and 25 °C and drops at higher and lower levels.
• Substantial differences in optimal temperature were observed between subjects.
Abstract
This longitudinal study examines the association between bedroom nighttime temperature and sleep quality in a sample of community dwelling older adults. Using wearable sleep monitors and environmental sensors, we assessed sleep duration, efficiency, and restlessness over an extended period within participants' homes while controlling for potential confounders and covariates. Our findings demonstrated that sleep was most efficient and restful when nighttime ambient temperature ranged between 20 and 25 °C, with a clinically relevant 5–10 % drop in sleep efficiency when the temperature increased from 25 °C to 30 °C. The associations were primarily nonlinear, and substantial between-subject variations were observed. These results highlight the potential to enhance sleep quality in older adults by optimizing home thermal environments and emphasize the importance of personalized temperature adjustments based on individual needs and circumstances. Additionally, our study underscores the potential impact of climate change on sleep quality in older adults, particularly those with lower socioeconomic status, and supports increasing their adaptive capacity in the face of a changing climate.
Adaptive capacity? I sure hope that means air conditioning.
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Will burn 80% of the wood and next oil fill up will be in March. If history repeats. 
Once you've acclimated to cold temps, it becomes hard to sleep otherwise (and admittedly the past few really hot summers have just about "done me in" given that I eschew air conditioning for fans and just a small bed-side portable evaporative cooler ) Much to my sweet doggy girl's dismay, I do, however, shut her favorite sliding screened patio door--typically opened at least a crack when it drops down to 32 outdoors overnight.
keep us toasty in bed at night. Seldom turn the heat above 60 in the winter. One advantage of a small house and 2 big 'ol pups 
Note: For those unfamiliar Landseers are basically Newfoundlands that look like dairy cows. They are absolutely wonderful dogs and they love winter
