BWT, what are your overnight flight must haves?

Doesn’t necessarily have to be just beauty / self care, but I wasn’t sure which tag fit this post best!

I’m going to be going on my first overnight flight from the US to Ireland, and will leave to come back to the US from London. I’ve never been on a flight longer than 4-5 hours, and while I’ve read a lot & watched a lot of videos, I don’t want to miss any recommendations that you might have! I’m not really one to do a whole beauty routine or skincare routine on the flight, so I’ll probably just have a few of my essentials that make me feel fresh in my carry on, but please recommend whatever you find makes it most comfortable, especially anything for sleep!

Edit: this flight is in early March so if anyone familiar with the area has any climate specific recommendations that would be great :)