Still Tired After the Clocks Changed? Here's Why

New Zealand's clocks go forward at 2:00am on Sunday 27 September 2026. A week on, most people expect to be back to normal — and plenty aren't. If you're waking at odd hours, foggy through the afternoon, or taking ages to drop off, you're in fairly ordinary company, particularly if you're over 45.

Here's why it drags on, and what usually shortens it. (Background on the change itself is in our guide to daylight saving in New Zealand.)

Why one hour takes more than one night

Your body clock doesn't reset in a single jump. It shifts gradually, in response to light, at a rate of roughly 30 to 60 minutes a day under good conditions — and considerably less when the conditions aren't good.

"Good conditions" means bright light early and dim light late. Spring daylight saving gives you the opposite: darker mornings and brighter evenings. So the environment is actively working against the adjustment for the first week or two, which is why it commonly takes longer than people expect.

After 45 this is compounded by a weaker light response — the ageing lens filters more of the blue light the body clock depends on — and by lighter, more fragmented sleep that makes the deficit harder to repay. There's more on this in does daylight saving affect sleep.

Three things that keep it going

1. The weekend lie-in

This is the big one. Sleeping in for two hours on Saturday feels like repaying a debt. What it actually does is give your body clock a second time shift, in the opposite direction, five days after the first one. Come Monday you're starting over.

Researchers call the pattern social jetlag — a persistent gap between your body's schedule and your social one — and it's the most common reason the clock change is still biting in mid-October. Hold your wake time within about 30 minutes, seven days a week, until it settles.

2. Bright evenings

The whole point of daylight saving is more light after work, and your body clock reads that light as a signal to stay up later. Which is exactly the direction you don't want to go while you're trying to move earlier.

For the next fortnight, treat the last two hours before bed deliberately: lamps not overheads, screens dimmed or away, and if you're outside in the late evening, accept that it will cost you.

3. Caffeine creep

Short night, tired afternoon, extra coffee at 3pm. That coffee then shortens the following night, and the cycle keeps itself going. Caffeine's half-life is around five to six hours and generally lengthens with age — the 3pm cup is meaningfully present at 9pm.

How to break the cycle

1. Pick a wake time and hold it. Same time every day including weekends, for two weeks. This is non-negotiable and it does more than everything else combined.
2. Outside within an hour of waking. Fifteen to twenty minutes. Overcast is fine. Through a window is not.
3. Caffeine cut-off at lunchtime. Temporarily, until the rhythm settles.
4. Dim from 8pm. Lamps, not overheads.
5. Same wind-down, same order, every night. Repetition is the point — it becomes a cue your body can read.

On that last point, Lifeguard Sleep is built to sit at a fixed place in that sequence: two capsules, 30–60 minutes before bed. Marine magnesium with tart cherry, lemon balm and saffron, doctor-formulated in New Zealand for adults 45+. Magnesium contributes to normal muscle function and normal functioning of the nervous system; the botanicals have a long tradition of use in calming evening preparations. No melatonin, nothing habit-forming.

If you'd rather start from the routine end, our 5-day adjustment plan works just as well applied after the change as before it. And if the problem is specifically waking in the small hours, Up at 2am deals with that directly.

When it isn't the clocks

Daylight saving is a convenient thing to blame, and for a week or two it's usually the right explanation. Past that, it's worth asking whether something else was already going on and the clock change simply made it visible.

Talk to your GP if any of these apply:

• Trouble falling or staying asleep on most nights for a month or more
• Loud snoring, gasping, or someone telling you that you stop breathing in your sleep
• Waking unrefreshed regardless of how long you were in bed
• Daytime sleepiness that affects your driving or your work
• Persistent early-morning waking alongside low mood or loss of interest in things
• New or worsening restless legs, or significant night-time pain

These have identifiable causes and treatments, and none of them are solved by adjusting your bedtime. Sleep apnoea in particular is common in adults over 45, frequently undiagnosed, and worth ruling out. Our guide to sleep disorders and insomnia after 40 sets out what to raise with your doctor.

Frequently asked questions

How long should it take to get over the time change?

Two to three days for many people, up to a week or so for others, and adults over 45 commonly report the longer end. Beyond two weeks, something other than the clock change is likely involved.

Why do I keep waking at 3am since the clocks changed?

Early waking is a typical sign your body clock hasn't finished shifting, and it's more common with age because the rhythm tends to run earlier anyway. Consistent morning light and a fixed wake time are the usual fix. If it persists for weeks, particularly with low mood, see your GP.

Can I catch up on lost sleep at the weekend?

Not effectively, and it tends to backfire — a long lie-in shifts your body clock back the other way and restarts the adjustment. Better to hold the wake time and let the nights fill in.

Does magnesium help after a time change?

Magnesium contributes to normal muscle function and normal functioning of the nervous system. It isn't a sedative and won't shift your body clock — that's light and routine. What it can do is sit in a consistent evening routine. We look at form, timing and dose in the best magnesium for sleep in NZ.