Winter is a wonderful time of the year – cosy nights in front of the fire, hot chocolate, comfort food and frosty days with bright blue skies. We can also feel a bit more tired and less energetic - and there’s a reason for this change. Here in the Northern Hemisphere, we are tilted away from the sun as part of the Earth’s natural orbit, and this is what makes the daylight hours shorter and darker hours longer. It’s colder too, as a result, making it harder to leave your cosy bed! All of this makes us want to sleep longer.
Sunlight helps our bodies to make vitamin D, which is essential for good health, so we notice a difference when we don't get enough. Less sunlight also causes our brain to produce more of the hormone melatonin, which makes you feel sleepy. These changes in daylight and melatonin levels have an impact on our internal clock, also known as our circadian rhythm. As a result of the darkness our brain tells us that we should be tucked up and sleeping more. Althoug