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I read there that it's not very good to wake up with the alarm clock, I didn't understand what he means by 'just wake up' haha how do i wake up in the middle of the night by myself? he said that everybody wakes up several times naturally but dont remember, but how do i control that?
You can use mantras/autosuggestion for that. Before bed, tell yourself you'll notice yourself waking up, and that you will get up. This may not happen overnight, but the more you do it, the better you get at actually waking up naturally. You can also do the sunlight thing, but make sure to close the curtains right away, because light will make you lose the sleepiness (tl;dr chemicals in your brain that make you sleepy are stopped by light you see). And if you expose yourself to light, you'll have a hard time letting your body sleep during your attempt.