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あらすじ・解説
You've booked your flight, reserved your hotel and packed your bags. So don't let jet lag, keep you from enjoying all the wonders on your itinerary. In this episode, you'll learn how to phase shift your circadian rhythm. So you can make memories that last forever. It's kind of fascinating to think about jetting around the globe. We can hop on a plane and be on the other side of the world by tomorrow. Or is it today? What time is it again? The problem is that our internal clocks. can't keep up. And it knocks the circadian rhythm for a loop. When your internal clock gets out of sync, it causes jet lag. Which can make us sleepy when we're supposed to be awake and enjoying our wonderful vacation or lying awake when it's bedtime in our dream destination. Either way, there are things you can do to lessen the effects. Jet lag causes insomnia by the de synchronization of the circadian rhythm. Well, that was enough 25 cent words to cut into your vacation budget, but don't worry. We'll go to mini medical school in a bit and learn more. But jet lag causes more than insomnia during the night and drowsiness during the day. It also causes GI upset, brain fog., bad mood and just feeling ick, in general. And even if you don't change time zones, it's hard enough to sleep in an unfamiliar place where there's light noise to contend with. And it can be made worse if the pillow is too flat or too thick. On the other end of the spectrum is daytime sleepiness. You've planned all those amazing excursions. And now you're struggling to stay awake and actually enjoy your trip. Jeez. And don't forget GI upset. Mostly it's decreased appetite and constipation due to eating at times you're normally sleeping, but some people get diarrhea and that's never a good travel companion. On top of that brain fog sets in which can make you and everyone around you and a bad mood. Decisions about where to go and what to eat, seem harder. And emotions get the best of you and sabotage your trip. So let the adventures begin. Whether you've personally experienced jet lag, have an upcoming trip, Or, just want to live vicariously. It's time to go to mini medical school. I always like to get started with a definition. Let's start with circadian rhythm. It's the 24 hour process that helps our bodies react appropriately to day and night, light and dark as the earth spins on its axis. Normally melatonin levels start to increase when light starts to decrease. Ideally, this happens about two hours before bedtime. And the term for this is dim light melatonin onset, or DLMO. This secretion in melatonin causes a drop in core body temperature, which in turn makes us a little groggy. This signals our body that it's time to get tucked in beneath the covers and get some shut eye. The rise in melatonin continues and it hits its max level after about seven hours. This peak coincides with the lowest level of core body temperature. And these two things happen about three hours Prior to wake up time. In the morning, the melatonin levels drop to zero and our core body temperature starts to warm up, and this starts the wake cycle, which lasts about 16 hours. The sleep wake cycle can be modified and the internal clock can be reset. Guess what the most powerful tool that resets the circadian rhythm is? It's bright light. In the natural order of things, the sun comes up, the rooster says cock a doodle doo, the farmer gets out of bed, works 16 hours, and everyone goes to sleep. The cycle starts over the next morning. But then we invented all kinds of things that screwed it up from light bulbs to night shifts, to screens that emit blue light. And that has a huge impact on melatonin secretion, which is what gets this whole ball rolling. When it comes to light, timing is everything. Let me introduce another term, entrainment. This is our ability to synchronize our internal clock based on external input from the environment. This makes your body's physical functions line up with your daily routines to coincide with day and night. And that's why typically people don't have the urge to empty their bowels during the night. It's also why your gastrointestinal tract can be all messed up when you travel. But other things besides light can help entrain circadian rhythm too, like exercise, meals, and social contact. Think about it. How many times have you stayed up late talking to friends? And then falling asleep when you're home alone or bored. Get out your notebook now because here's the science you need to know about jet lag. It's all about phase shifting. Either delaying or advancing depending on which direction you're traveling. Bright light packs the biggest punch when it shines during what should be night time. Because that's when melatonin is secreted, remember? In normal people, the lowest core body temperature is in the evening. So bright light after the low core body temperature, moves that circadian rhythm forward. That's called a phase...