The 9-minute snooze duration is a leftover tradition from early mechanical alarm clocks, where it was technically easier for clockmakers to implement a single-digit delay (9 mins) around existing gears than a precise 10-minute interval, a standard adopted by digital devices like Apple's iPhone as a nod to this history. This choice also offered a practical sleep benefit, preventing users from falling into a deep sleep that makes waking harder.
When the snooze feature was added to alarm clocks years ago, it was done so by retrofitting the new snooze component in the design of an existing clock. As Apple Explained says, "This was a problem, since they [alarm clock makers] couldn't adjust the clock's gear teeth to line up perfectly for a ten-minute snooze.
It turns out it's because clockmakers couldn't align the clocks gear teeth to line up perfectly for a perfect 10 minute snooze, so they made the decision to make it 9 minutes…
While that pesky 9-minute duration is still selected by default, you can now tap the "9 min" button, which allows you to scroll up or down to choose how long you want your snooze to last. You can choose between 1 and 15 minutes.
The "2 by 3 alarm rule" is a technique to become a morning person by setting two alarms: the first one 90 minutes before you need to wake up (to break deep sleep) and the second one (the actual wake-up alarm) three minutes later, or sometimes just shortly after the first to force you out of bed and prevent snooze-hitting. It leverages sleep cycles (approx. 90 mins) to help you wake at the end of a cycle, reducing grogginess, though some experts suggest it can fragment sleep, and one alarm is often better.
When electro-mechanical clocks were prevalent in households around the world, it was a difficult task to actually set an alarm accurately. And this is why makers would go for 'less than' 10 minutes, i.e. nine minutes, due mainly to the gearing in the timepieces.
The 9-minute interval originated from the first snooze alarm invented by General Electric-Telechron in 1956, chosen for mechanical simplicity.
“Unfortunately, the snooze alarm disrupts some of the most important stages of sleep,” said Robbins. “The hours just before waking are rich in rapid eye movement sleep. Hitting the snooze alarm will interrupt these critical stages of sleep and typically only offer you light sleep in between snooze alarms.
To wake iPhone, do one of the following:
The optimal period to spend snoozing—for chronic snoozers who aren't sleep-deprived—is somewhere between 20 and 30 minutes, says Kilkenny, who suggests this is enough to be “refreshing but not too much.” It's equivalent to hitting the snooze button every five to 10 minutes for a total of three or four times and is ...
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Alarms can be set for any time and repeated on specific days of the week. You can also adjust how long the snooze lasts. Siri: Ask Siri something like, “Set an alarm for 7 a.m.” Learn how to use Siri.
Sleeping from 10pm to 5am can be adequate for many adults. Seven hours of sleep allows you to cycle through the necessary sleep stages multiple times, supporting cognitive function and physical restoration.
The struggle is real in people suffering from ADHD. Hitting snooze repeatedly, setting quite a few alarms, dragging yourself out of the bed and feeling tired in the first half of the day. Some need a loved one to help them starting the day, be it a parent a friend or a partner.
The new study, performed at Stockholm University, showed that snoozing up to 30 minutes each morning didn't have any negative cognitive effects on their sample, which was made up of serial snoozers who don't have any sleep disorders and typically get the recommended seven or eight hours of sleep per night.
Common reasons your iPhone alarm isn't going off
Here are the most common: Attention Aware Features are lowering sound alerts. Your alarm volume is too low or muted. Do Not Disturb or Sleep Focus is on.
Key Takeaways
Traditional alarm systems rely on hardwired components and provide reliable security but lack modern connectivity options. Smart alarm systems offer remote access, customizable features, and integration with other smart home devices, enhancing convenience and security.