Agree with M0nica - if you want to stay in bed all morning, wrapped up, with a good book or film, that's what you do.
Make sure you have some nice things to eat, especially a nice meal that's really easy to prepare. It's important that you eat properly as well as all the 'luxury' stuff. If the sun shines go for a nice walk and admire the lights and decorations. Sit and people watch.
If you start to feel miserable just think of all the people all over the country trapped with family they don't like who would give a lot for some peace and quiet 😉 Sometimes we are inclined to think that everyone else is having fun when we have problems, but in reality for every person having a great time there is someone having a bad time.
And remember - it's just a couple of days, then everything is back to normal.