Hebrews 5 - Key

v14

But strong meat belongeth to them that are of full age, [even] those who by reason of use have their senses exercised to discern both good and evil.

Discernment seems kind of like exercise. Sometimes we suffer, being tempted.

v8

Though he were a Son, yet learned he obedience by the things which he suffered;

It's difficult to make the right decision, to choose the good and refuse the evil. But, as we do, it becomes a habit and we get better at it.

Application

I'll make myself get up earlier sometimes, even if I went to bed late. Then also, when I try to go to bed earlier, it might be easier to sleep.