is it healthy to catch up on sleep all in one day?

Yup, it is ok since the body would really signal you to wake up when it had rested well and gathered the strength it need for the next day. As you've said you are drained out because you moved so I guess that is just a normal body reaction. I did not all day after I accompanied my daughter in their fieldtrip but I felt asleep at once after bathing and woke up late the next day. I think what is bad is sleeping late all the time, getting only 5 hours or less of sleep and then sleeping htrough the weekend because you can never catch up those sleeps you've missd on the weekend.

I have gone all week when I have slept maybe 3 or 4 hours a night and thought at the weekend I have to catch up with my sleep but I've never been able to sleep all day long. The most I've been able to do is probably have a long sleep on the Friday night - say 6 or 7 hours, have a big breakfast and then sleep through most of Saturday morning and then early to bed on Saturday evening. But I'm never able to actually "catch up" on the hours I think I'm missing. I accept it now, I guess being 40, I'm at the age where one doesn't strictly need to have 8 hours a night. In fact, my hubby's GP said at our age we only need about 6.5 hours sleep a night. I wouldn't mind having that if only I could sleep for that period straight, i.e. without waking up several times in between!

Theres time I wish I could sleep all day. I believe if it becomes a habit then there is a problem. But once in a blue moon i'm pretty sure theres nothing wrong with that. Good luck in your new home.