Arab weather - one day consists of 24 hours divided between day and night, so that the day hours are long during the spring and summer months and the night hours are shortened, while the opposite happens during the autumn and winter months in which the sun sets early and is late in its rising time, which means longer night hours, so Some countries adopt the fluctuation between winter time and summer time as a natural simulation of the changing times of sunrise and sunset with the change of seasons.
It is expected that the winter time will start in the Kingdom this year, starting from the dawn of Friday, which will coincide with the 29th of next October, by delaying the clock by 60 minutes at one o’clock in the morning.
Winter time will continue for this year (2021), approximately 4 months, until work returns to summer time, by advancing the clock by 60 minutes, starting from midnight on the last Thursday of February.
This means that you'll get an extra hour of sleep in the morning, if you keep your usual bedtime before switching to winter time.
For example: If you go to bed at 10 PM DST and wake up at 6 AM , that's 8 hours of sleep, when you switch to winter time, your biological clock will tell you your usual bedtime, which is 9 PM (10 DST), and you'll wake up at It's 6 a.m. (7 GMT), which means you'll get 9 hours of sleep.
The body tends to fall asleep naturally after sunset and wake up at sunrise. Light, especially natural light from the sun, affects the body upon waking. When exposed to sunlight, the mind will tell the body what to do based on this information.
For example, your brain will start producing melatonin when the sun goes down, so you will naturally feel sleepy after sunset. Exposure to sunlight regulates your body's melatonin levels to keep it functioning during the day and help you sleep at night.
In summer, the sun usually shines brighter than in winter, for this reason, it is easier to wake up during summer, and easier to sleep during winter because levels of exposure to light vary greatly.