dr. nina radcliffe, private practice m.d. and anesthesiologist joins us now. thank you, dr. nina.reat to see you. >> happy holidays. >> what are you going to do? it's the holidays. people are toasting, you see family and friends that you don't normally see. how do you stop from indulging? >> this is a wonderful time of year. there's plenty of seasonal food and drinks. it does cause us to let things fall to the waysides. this can throw off our circadian rhythm affecting us in many ways. >> you mentioned -- that is fascinating. when you think about the holidays, you might drink or eat too much, but your sleep could be messed up. a lot of people are traveling, in the guest room, kids on the couch, maybe they're sleeping in their childhood bedroom one more time. tell me more, how hard of a hit does that make? >> it does. our internal clocks, circadian rhythm, fakes our bodies like our liver, for example. we want to avoid extreme behaviors, fine to stay up a few hours late, but try not to stay up past to hours. that can affect our sleep. >> what about the combination of these factors?