I don’t actually know your sweetie, so I can’t be sure, of course. But if you’d like an educated guess from a pro, here’s what s/he may be longing for: chill time, preferably with you.
The holidays are such a busy time of year that we tend to back-burner the people who are in our lives every day. There’s so much going on with relatives, out-of-town visitors, travel, and all the rest that you may hardly have seen each other—really seen—for weeks. One or both of you may be just plain wiped out.
If that’s the case, take corrective action. Talk to your honey and ask what he or she needs right now. A walk or a quiet dinner with you? Schedule it ASAP. Sex or cuddles so you can reconnect? Put that at the top of your priority list. A few hours alone to just breathe? Give him/her some space to relax and restore. (If that’s what your partner asks for, no grumpiness allowed. Needing space for a few hours is not a reflection on you or your relationship. Plus, you can ask for connecting time after he/she has rested.)
The holidays are wonderful, but they can be overstimulating. Give your beloved (and yourself) a chance to bask in some quiet and savor the memories.