if you’re dealing with jet lag waking up at 3am, you already know the feeling. it’s 3:18am and I’m in a hotel room in london and I’ve been awake for forty minutes.
the blackout curtains are doing their job. the room is dark and quiet and a perfectly reasonable temperature. outside it is apparently still night and will be for several more hours. my body is completely unaware of this. my body has decided it’s morning. my body is wrong.
I flew east. five time zones. arrived yesterday, ate dinner at what felt like 2pm, dragged myself to 10pm local time out of sheer stubbornness, and fell asleep in about four minutes flat because I was genuinely barely functioning.
and now here I am. 3am. wide awake in london like I have somewhere to be.
okay so here’s what’s actually happening, as best I understand it from the amount of sleep research you read when you can’t sleep.
your brain has this region called the suprachiasmatic nucleus — SCN, because saying the whole thing is a lot — and it’s basically a tiny clock that runs everything. when to feel alert. when to produce melatonin. when to push heat to your hands and feet so your core temp drops enough for sleep to happen. all of it. Sleep Foundation has a solid breakdown of how this works if you want to go deeper.
that clock is set by light. specifically by the light-dark cycle of wherever you’ve been living for the past however many years.
when you fly across five time zones, the clock does not update immediately. it updates slowly. about one time zone per day, if you’re lucky and doing the right things. which means if you flew from new york to london, your SCN is still running new york time for the next five days. so when it’s 3am in london, your body thinks it’s 10pm in new york. too early to be asleep. time to be vaguely awake and unproductive.
which is where I am right now, apparently. running on new york settings. hello from my own internal timezone.
the cortisol thing is also part of it and it’s the part that makes the 3am wake-up feel particularly personal.
cortisol is what your body uses to drag you into consciousness. it starts rising in the early morning — your early morning, wherever your clock thinks you are — to get you going. heart rate ticks up a little. alertness follows. it’s a perfectly reasonable system that works great when you’re in the right timezone.
when you’re jet lagged, that morning cortisol rise fires on home time. so you’re four hours into sleep, in a hotel room, in a different country, and your body just quietly decides: morning now. wake up. things to do.
there aren’t any things to do. it’s 3am in london. but the cortisol doesn’t know that.
I wrote about how cortisol affects sleep outside of travel too, if you want the longer version — the 3am cortisol piece covers what happens when this occurs at home for reasons that have nothing to do with jet lag.
eastbound is worse, which I know now, which is not useful information retroactively.
when you fly east you’re trying to advance your clock. go to sleep earlier, wake up earlier, function on a schedule that’s ahead of where your body is. most people’s circadian rhythms naturally run a little longer than 24 hours, which means delaying — flying west, staying up later — tends to go easier. advancing is harder. your body resists it.
so london from new york is a bad direction. paris from LA is a bad direction. you’re fighting biology. westbound you get exhausted evenings, which is annoying. eastbound you get jet lag waking you up at 3am with no warning and no apology, which is worse.
not that I’m suggesting you only travel west. I’m just saying I now understand why coming home always feels easier.
what helps when jet lag has you waking up at 3am
light is the main thing. the most powerful thing. embarrassingly simple thing.
your SCN resets based on light exposure. morning light at your destination tells your brain it’s morning at your destination. it’s not a metaphor, it’s a direct signal. get outside in the morning — actual outside, actual sunlight, not standing near a window — for at least twenty minutes. it physically shifts your clock faster toward the new timezone.
the flip side: no bright light at night. and especially not when you wake up at 3am. do not pick up your phone. I cannot stress this enough. your SCN cannot tell the difference between the sun and your phone screen at that distance and level of brightness. if you wake up at 3am and immediately start scrolling, you have just told your brain it’s morning. you have caused your own problem. put the phone face down. stay in the dark.
melatonin has a job but it’s not the job most people think it is
it doesn’t put you to sleep. it’s not a sedative. it’s a timing signal. it tells your brain that darkness is here and sleep should be approaching. at low doses — half a milligram, one milligram, genuinely less than most supplements sell — taken at your destination’s bedtime, it helps shift the clock a little faster.
people take 5mg and then feel groggy the next day and decide melatonin doesn’t work. the dose is wrong. more melatonin doesn’t mean more sleep. it just means more melatonin.
eat on local time
I don’t fully understand the mechanism here except that your digestive system has its own internal clock and meal timing sends it signals about what time it is. eating breakfast at 7am london time even when your body thinks it’s 2am new york time helps anchor you to where you are. same with lunch, dinner. eat when locals eat, even if it feels weird.
don’t skip meals because you’re not hungry. use the meals as timezone anchors.
naps. be careful.
I know you’re exhausted. I know a two-hour nap sounds like exactly what you need. the problem is that sleep pressure — the actual biological tiredness that accumulates the longer you’re awake — is one of the main forces that gets you to sleep at night. a long afternoon nap dumps some of that pressure. then night comes and you can’t sleep and you’re confused about why.
twenty to thirty minutes, early afternoon, that’s it. set a loud alarm. do not trust yourself to wake up naturally.
and if the jet lag waking up at 3am part is where it really falls apart
because sometimes it’s not just that you wake up. it’s that once you’re awake you can’t get back. the brain kicks on. you start doing math about how many hours of sleep you’ll get if you fall back asleep right now. you check the time. you check it again. you think about tomorrow’s meeting and whether the jet lag will make you sound stupid and whether you should just give up and order room service and watch something.
all of that makes it worse. checking the time makes it worse. calculating the hours makes it worse. the effort of trying to fall asleep creates a kind of alertness that prevents falling asleep.
I wrote more about the racing-brain-at-night situation here — it’s about general sleep onset stuff but the 3am version is basically the same problem. the short version: stop trying. if you’ve been awake for more than twenty minutes, get up. sit somewhere boring and dark. don’t start a show. wait until you actually feel sleepy again.
the bed-means-sleep association matters even in a hotel room. if you lie there awake and frustrated for an hour your brain adds that to its dataset. this is not helping you.
anyway.
jet lag waking up at 3am is just your body running on home time. the SCN is still in new york. the cortisol rose too early. nothing is wrong with you. nothing is broken.
light in the morning. dark at night. melatonin timed right. eat on local schedule. keep naps short. don’t fight the 3am wake-up, just stay calm and dark and horizontal until it passes.
it gets better by day three usually. day four you’re basically fine.
day five I’m typically ready to fly home and do the whole thing in reverse.
This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making changes to your health routine.
