Serious lack of sleep in the long term? Scientists: "Sleep debt" can be repaid

Let's do the math on sleep. Last week, in order to meet a big plan by Friday, you had to go to bed two hours later every day. By the weekend, with a sigh of relief, you caught up on sleep - sleeping 4 more hours on Saturday and Sunday compared to normal. By Monday morning of the next week, you felt refreshed and full of energy, and only drank one cup of coffee during the morning at work - usually, you need two cups of coffee to stay alert. In fact, you were deceived by your bright eyes and energetic appearance: you were still severely sleep-deprived, which scientists call "sleep debt". In this example, it's a six-hour sleep debt, meaning one night of lost sleep.