How to Switch From Night Shift Back to a Day Schedule

A sensible way to switch from nights back to days is a short sleep the morning after your last shift, then getting up, getting into daylight and going to bed at a normal time that night. The National Institute for Occupational Safety and Health (NIOSH) specifically warns against staying awake the whole day after your last night shift, because you end up awake for far too many hours in a row ^[1]. Your schedule can flip in a day. Your body clock may need several more days to catch up.

The one-day switch, step by step

Say your last shift ends at 7 a.m. Plenty of people grit their teeth, stay up all day and crash at 9 p.m. By then they have often been awake for more than 24 hours, and NIOSH notes that stretches that long raise the risk of accidents and injuries ^[1]. A gentler version goes like this:

1. 8 a.m.: get home safely (if you're drowsy, get a ride rather than drive) and go to bed, but set an alarm. A few hours of sleep, ending around late morning or noon, takes the edge off without wrecking your night.
2. Midday: get up, even if every cell protests, and get outside into daylight.
3. Afternoon: stay active, keep any caffeine early, and resist a second long nap.
4. Evening: dim the lights, eat at a normal dinner time and go to bed at your usual day-schedule hour.

The first night back is often lighter or shorter than you'd like. That's normal. Get up at your target time anyway, because a steady wake time pulls the rest of the schedule into line. If you'd like each day's bed and wake times laid out for you, the sleep schedule calculator can build the plan.

Days off: anchor sleep or a full flip?

Every night worker knows this dilemma. You have three days off and you want daylight, family and friends. But flipping fully to days and back again once or more a week can leave you in what NIOSH calls "a perpetual state of jet lag" ^[1].

NIOSH describes a compromise. On work nights, sleep as soon as you get home, say from 8 a.m., and for as long as you can. On days off, stay up until around 3 or 4 in the morning, then sleep in until about noon or 1. That way a set block of hours, such as 8 a.m. to noon, is sleep time every day, working or not ^[1]. The American Academy of Sleep Medicine gives similar advice: try to keep the same schedule on workdays and days off ^[2]. The Sleep Foundation adds that people on permanent nights do best keeping a consistent schedule even on days off, while acknowledging that family and social obligations shape what's realistic ^[6].

So here's a workable rule of thumb. For a short break between runs of nights, anchor your sleep. For a long break, or the end of a rotation, switch properly. Plug your own shift times into the night shift sleep calculator to see what an anchored schedule looks like.

How long a full switch takes

There's no fixed number, because it depends on how far your body clock actually moved during your nights, and that differs from person to person and from one run of shifts to the next.

Jet lag makes a handy comparison. Going from nights to days asks your clock to move earlier, the same direction as flying east, and the CDC's travel guidance puts eastward adaptation at roughly one hour per day ^[7]. If your clock had drifted a long way, full recovery could take days, even though your timetable changed overnight. The good news, from the American Academy of Sleep Medicine, is that sleep problems linked to shift work usually ease once you are sleeping at conventional times again, though some people keep having trouble after the shift schedule ends ^[2]. If that's you, see a doctor.

Light: what to seek and avoid on the switch day

Light is the biggest lever you have, and timing is everything. In a detailed lab study, bright light before the low point of the body's temperature rhythm shifted the clock later, while light after the low point shifted it earlier ^[3]. After a run of nights, that low point may well have drifted later than usual, toward the morning.

On the drive home, safety beats chronobiology. If someone else is driving, you can keep bright light down. If you're the one driving, skip the dark glasses and concentrate on staying alert. From midday through the afternoon, get as much outdoor daylight as you can, since this is the light most likely to pull your clock earlier. In the evening, keep lamps low and screens dim so you aren't nudging yourself back toward nights.

Switching the other way: day to night

Starting a block of nights has its own version of the same mistake. NIOSH warns against staying awake all day before your first night shift, too ^[1]. The American Academy of Sleep Medicine suggests beginning to shift your sleep a few days before a big schedule change, and points out that it is easier to stay up late than to go to bed early ^[2]. The nap that makes that first night easier is covered in our guide to sleeping before a night shift.

Driving safety on switch days

Switch days are prime time for short sleep, and short sleep and driving don't mix. In a CDC survey of more than 147,000 adults, 6.7 percent of people who usually slept 6 hours or less said they had fallen asleep while driving in the past month, compared with 2.6 percent of those who slept 7 to 9 hours. The report also names people who work nights or long shifts as being at higher risk ^[4].

If you feel drowsy before you leave, don't drive. Ask for a lift or use public transport instead. Cranking the music or winding down the window hasn't been shown to keep a sleepy driver awake ^[4]. If drowsiness hits on the road, pull off at the next safe spot and stop. NIOSH notes that a nap of even 15 to 20 minutes can help, and that you can have caffeine just before that short nap, but only as a temporary aid; neither replaces proper sleep ^[5]. Even a small amount of alcohol on top of long wakefulness makes driving performance worse ^[5]. To see how many hours you've been awake and what that means, try the sleep deprivation calculator. It can't tell you that you are safe to drive, and if you feel drowsy, do not drive.

Change the timetable in one day, then give your body clock the days it needs. A faster switch is never worth a drowsy drive.