The good news is that it is perfectly normal to wake up in the middle of the night, even more than once. As Tal mbg explains, this used to be the norm. Before the Industrial Revolution, he said, "We'd go to bed a little earlier than we do now, and we'd basically wake up in the middle of the night, go to the bathroom, hang out, maybe have a cup of tea, and then go back to sleep and get some sleep. "
As we began to cement our post-industrial sleep revolution, insomnia became more prevalent. However, waking up in the middle of the night does not necessarily mean that you will lose deep sleep: "Usually, you wake up between sleeps so you don't really interrupt anything." It's easier to wake up during a light sleep (stage 1 or 2) such as a sound or the need to pee, and that's perfectly normal, he says.
If you wake up four to five times a night, it will gradually become excessive and could be a sign of an underlying medical condition. In addition, it shouldn't take much longer than 15 to 30 minutes to get back to sleep. So, if you're dealing with a lot of wake-ups or unable to get back to sleep, you may need to work with a professional such as a sleep psychologist.