Spring fatigue is a condition that may make you feel more tired than usual during the seasonal transition from winter to spring.
It can also affect your concentration and appetite.
It all has to do with how the body deals with the seasonal change.
Exposure to sunlight increases the brain's release of the hormone called cortisol.
Because of this, even people who are visually impaired can tell the difference between day and night.
When the sun sets, the brain produces the sleep hormone melatonin.
This is why it's more difficult to wake up after long winter nights than in the summer.
As the season moves from winter to spring, earlier secretion of cortisol can lead to spring fatigue.
The sun rises earlier as the season moves from winter to spring.
Your alarm clock is set at the same time, but the brain wakes up about 30 to 40 minutes earlier and makes you sleepy during the day.
Various sources of light also blur the lines between day and night, causing sleep disturbances and resulting in more tired days.