Thank you but I wish you were not doing it during your night time. Let someone in their timezone for whom it's daytime do it. Insist on it, refuse being exploited. Take this opportunity to tell your company to hire the time timezones where it's day during your night. If it's not important enough for them then they anyway don't need to you remain awake at night. Don't harm yourself. It's not just losing sleep, that leads to harmful effects in your body that keep showing for long and some damages might not even be reversible.
It's not bravery, it's not being a hero as many are putting in comments - it's just plain exploitation if you are awake at night doing this.
Your health and wellbeing is not worth any money and definitely not worth someone's shopping cart and checkout page working smoothy over the holidays when your Western colleagues just took off en masse. Not even close. I know a lot of you would be from a third world country like me (yes, that's a thing!). Stay strong and work for this exploitation to end.