Researchers say sunlight and temperature are two factors that cause humans to sleep more in the winter. Here are some tips on getting enough rest.
Experts explain why it's OK if you want to sleep more in winter
How the seasons change our sleep
Why does the winter weather make us feel so sleepy?
Benefits of Being Pregnant in the Winter - Kernodle Clinic
An udder controversy 馃悇 - Healthline
The science behind sleeping more in winter
Embracing the snooze - by Kari Leibowitz - Wintry Mix
Here's why you tend to sleep more during winter
Humans Need More Sleep In Winter - BioTechniques
Why we're wired to rest in winter
Why Do You Feel More Tired In The Winter?
Humans 'may need more sleep in winter', study finds, Sleep
Seasonal sleeping: Why we need more rest in the winter - Health - Dunya News