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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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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