Why do you wake up earlier than usual on weekends?

Sleeping in late should be one of the best things about the weekend.After a long, grueling work week, sometimes the only thing you want to do is sleep through the night.By Friday night, you're lying in bed, expecting to sleep until the afternoon.You feel like you're finally getting enough sleep.But it turns out you can't even sleep late.When you open your eyes on Saturday morning, it's still early.If it's a workday, you can get up before the alarm goes off.Why on earth is that?

The effect of the body clock
In fact, we don't want you to be surprised. Maybe you do too much.Your body recognizes and adjusts your daily routine well.If you have a nine-to-five job, it means you need to get up at least five days a week, allowing your body clock to wake you up at certain times of the day.
Waking from a deep sleep may seem like a flash in the pan, but it's actually a gradual process.Within an hour of waking up, your blood pressure and body temperature will rise, as will levels of stress hormones such as cortisol.After a minute and a minute, you become more alert before you fully wake up.You can choose to turn off the alarm clock, but your body clock is still ticking.