I usually set up about 6 alarms or more to help me wake up in the morning because I’ve had numerous occasions of not waking up at the first alarm or second. I’ve noticed times where it’s never the same alarm that wakes me up, it usually changes so I know all the alarms are working (volume all the way up and has some kind of annoying sound/ringtone. I’ve also had to change the sounds to it when it’s reaching the later alarms because I somehow manage to start ignoring it.
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Long answer short the human brain is amazing. It can filter out sounds and smells that we get used to. Like if you live in a part of town that has intermittent loud sounds your brain will eventually filter it out so you don’t notice it.
I lived in a building that was by some LRT (light rail train tracks) and within two weeks i didn’t even notice them. My brain determined that the sound was unimportant when i was in my apartment and as such didn’t tell me about it.
https://www.livescience.com/3949-brain-tunes-background-noise.html
It’s all about our priorities, i have an alarm app which doesn’t shut off until i solve 5 sum problems, *i am weird*, and i have 5 alarms like this with 5 minutes gap, when i don’t have anything to do, i wake up solve them, sleep. But when there is a priority, i wake up.
Today i had a project submission at 8 am, i know my grade depends on that, i know it’s important, i woke up to the first alarm at 7:20 am and turned off rest of the alarms and made sure everything was working fine in my code and project.
I had that and took one day to train to get the f**k out of bed:
Set Alarm within 5 minutes, went to bed, closed my eyes and stood up immediately as the alarm went on.
Did it with variations of minutes the whole day and it worked fine.
Just make it important to get out of the bed. Turn of every other alarm keep one. If you don’t get up you get in trouble but prepare something you like, maybe get up a half hour earlier to listen to your favorite music?
Here are a couple of other possibilities aside from priorities.
1) Sleep stage
There are two types of sleep: Rapid Eye Movement (REM; associated with more vivid dreaming) and non-REM(NREM; which prepares the body for sleep and helps with recuperative processes).
Non-REM sleep normally starts pretty quickly after you nod off and can be broken down into 3 or 4 stages – the third is sometimes split into 2 levels depending on the source, but 3 is [the consensus as of 2007](https://www.sleepfoundation.org/articles/stages-of-sleep). You become less susceptible to outside stimuli (such as noise) as you progress into deeper levels, with deepest sleep ([deeper than REM](https://www.cnet.com/health/how-sleep-cycles-work-rem-vs-deep-sleep/)) occurring at stage 3.
NREM and REM stages cycle throughout the night, so there’s a possibility that your alarm could coincide with a deep sleep stage and be ignored.
2) [Sleep-wake homeostasis](https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Understanding-Sleep)
“The homeostatic sleep drive reminds the body to sleep after a certain time and regulates sleep intensity. This sleep drive gets stronger every hour you are awake and causes you to sleep longer and more deeply after a period of sleep deprivation.
Factors that influence your sleep-wake needs include medical conditions, medications, stress, sleep environment, and what you eat and drink. Perhaps the greatest influence is the exposure to light.”
So depending on on your health and environment, you might also experience more deep sleep.
All the other answers so far are mostly wrong. The human brain maintains a [circadian rhythm](https://en.wikipedia.org/wiki/Circadian_rhythm) and contains structures that basically somewhat keep time.
Your brain follows these cycles among other things, indicating to release chemicals that influence hunger, sleep, and more.
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When you sleep, you undergo sleep cycles. Usually two 3-4 hour periods of deep sleep while your brain organizes itself. This is why most people need 6-7.5 hours of sleep.
A deep sleep needs to be hard enough to wake from that you don’t interrupt your brain organizing things, but light enough you can awake to actual danger. Some people get used to their alarms and your brain knows it’s not dangerous.
If you wake up in the middle of a deep sleep when your brain isn’t finished, you’ll feel groggy and tired.
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There are a lot of sleeping apps that can help you chart your sleep cycles and help you settle down and wake up at appropriate times so you can be healthier and more active.
These apps use the microphone to hear you move, accelerometer to detect movement rolling over on your bed, which your brain does mostly between sleep cycles.
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TLDR: You need to sleep enough at the the same time every night.
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