Start from right view. Try to think that whatever happens is nature and try to be mindful of something.
If your mind is involved with thinking, then the depression gets worse and worse. Try to be aware of some neutral object and have right attitude. Slowly, you can calm down and be more awake.
Sometimes, you cannot only be mindful and mindful. Because of wrong view, when you watch your mind, you can become more depressed.
If they only meditate, they cannot overcome it. If they don’t understand right view, then problem comes because if they watch themselves, they have more suffering and they are finished.