Daylight saving time and baby sleep: how to see what the clock change did with a simple log

Nothing happens to your baby at the moment the clock moves. What shifts is everything you do by the clock: the morning when you want them up, the nap you plan for noon, bedtime, and the light in the room. When the clocks go back, a baby who woke at 6:00 may now wake at what the clock calls 5:00, and that can feel like a very early start. Most families find things settle in the days that follow, but how fast differs from baby to baby.

Advice online ranges from “do nothing, it will sort itself out” to moving bedtime in 10 or 15 minute steps over several days. We did not find an official AAP or NHS rule for the clock change, so we do not give one here. If your baby has a hard time, or has a feeding or health condition that makes timing important, ask your pediatrician or health visitor what suits your baby.

After a clock change, parents often disagree about what happened: “she woke up so early” or “he barely napped”. With a log you can see it. Three numbers are enough:

• The time your baby woke up each morning.
• The time and length of each nap.
• The time they went down for the night, and how long the longest stretch was.

Write them down for the week before the change and the week after. If the morning wake-up moved by an hour for three days and then crept back, that is the baby adjusting. If nothing changed after a week, or sleep got a lot worse and stayed worse, take the notes to your pediatrician: they are far more useful than “she is sleeping badly”.

An iPhone changes its own clock if Settings, General, Date & Time, Set Automatically is on, which it is by default. If you turned it off, the times in your log, your alarms and your widgets will be an hour out until you change it back. Check it once, the day before.

If you keep a paper log, add a small note on the day of the change (“clocks back”). A single line saves you from wondering later why one night looks an hour longer.

On the day the clocks go back, the day has 25 hours, and on the day they go forward it has 23. A night that crosses the change really is an hour longer or shorter than the clock times suggest. If you work out a night's length by subtracting the clock times in your head, you will be an hour off. Count real elapsed time, or let your app do it.

The same applies to daily totals. A day of 25 hours can legitimately hold an extra feed or a longer stretch awake, so do not read much into one odd total on that date. Compare weeks, not that single day.

Baton stores every entry's time as an absolute moment (UTC), so a sleep that runs across the change keeps its real length. Day totals and charts are cut at local midnight, which means that on the change day they cover 23 or 25 real hours rather than a fixed 24. This is covered by the app's own tests for the 2026 US dates.

Everything that depends on the clock face follows your phone. A sleep that starts between 19:00 and 05:59 is counted as night sleep, and night mode starts at the time you set (20:00 to 07:00 unless you change it), so after the change they cover the new clock hours. If you want night mode to begin when it gets dark for your baby, change the times in the settings.

The free Today screen shows how long your baby has been awake since the last wake-up, which stays correct through the change because it counts elapsed time. A feed reminder (a Baton Plus feature) also counts hours from the last logged feed, not a time on the clock, so it keeps working the same way. Baton Plus's Next nap window is a suggestion from published age ranges, and the app does not adjust it for the change, so treat it as a rough guide for a few days and trust your baby's cues. Baton only records what you enter. It does not tell you what your baby's sleep should look like.

Whatever the time says, every sleep, including a nap that is an hour off, follows the same safe-sleep basics from the AAP: baby on their back, on a firm, flat surface, with nothing soft in the sleep space. If a baby is very hard to wake, or you are worried about their breathing, call your doctor or the emergency number rather than waiting to see what the log shows.