I want to use this space to record some insights I’ve learned from reading and from my own experience.
I’ve had a terrible sleep cycle for years. I almost never went to bed before midnight. Sometimes it was as late as 3 or 4 a.m. I would sleep, wake up at 8, then fall asleep again and wake up around 10 or 11. Then I would go about my day feeling sleepy on and off in the afternoon, only to become wide awake again late in the evening.
Now I’ve been trying to improve this. I’ve started going to bed a little earlier each night. I can’t change everything at once—if I suddenly go to bed at 10 or 11 p.m., I won’t fall asleep anyway, and it would be pointless.
I’ve been working on this self-improvement project with ChatGPT, and today I learned something about myself. My afternoon sleepiness doesn’t really go away with walking, drinking water, or splashing water on my face. When I sit down to work, I still feel sleepy and my eyelids get heavy after a while. So I realized that while lack of exercise is part of the problem, it’s not as big as my long-term sleep deprivation. The conclusion seems to be that I need to allow myself to take naps during the day when I’m at home—and most importantly, I must stop creating more sleep debt at night. If I decide to sleep at 1 a.m., then I should wake up at 7 or 8. If I want to wake up at 6, I need to go to bed at midnight or earlier.
Later, I read more about sleep debt and found this information, which I think is useful to share. At the same time, it also made me feel a bit sad, because some of the damage I’ve done to myself may not be easy to repair.
- Sleep debt is the difference between how much sleep you need and how much you actually get. For example, if your body needs 8 hours but you only sleep 6, you lose 2 hours. If that happens for seven nights, you accumulate about 14 hours of sleep debt.
- Sleep debt can cause many problems: persistent sleepiness, fatigue and low motivation, forgetfulness, slower thinking, poor concentration, irritability, more mistakes at work, stronger cravings for food, and higher risks of accidents, type 2 diabetes, cardiovascular disease, and hypertension.
- Recovery sleep helps, but large amounts of sleep debt cannot be erased by just one long night. You may feel better after sleeping in on the weekend, but your body is not fully repaired. The better approach is to gradually add more sleep each night and take short naps when needed, while avoiding repeated short nights.
- One article said it may take about four nights to recover just one hour of sleep debt. (So… for me, it might take a lifetime.)
Some researchers say that while cognitive function can improve, deeper physiological effects—like metabolism and immune function—may not fully return to normal after long-term deprivation.
Debt is always a bad thing. When you are in debt, you have to pay it back or face consequences. Sleep debt is no different. If it’s small, you'd repay it early. Otherwise, you may end up living with long-term health problems.
I do feel sad that I’m taking this seriously a bit late, after years of severe sleep deprivation. But tonight, I will start paying back some of that debt anyway. No matter what, it’s better than continuing to create more and slowly harm my body and mind.
Good night, everyone.








