Welcome to the forum, michaelhuynh.
First of all, you can combat the problem of not being tired enough for sleep by only going to bed when you feel sleepy enough for sleep. This sounds like common sense, but it is very easy to confuse fatigue for sleepiness and, therefore, go to bed before you are ready for sleep.
More on the difference between fatigue and sleepiness in this video: https://www.youtube.com/watch?v=_KwrOcyUBt0
You would likely benefit from implementing a few CBT-I techniques — specifically, making sure you are allotting an appropriate amount of time for sleep, always getting out of bed by the same time every day, and getting out of bed when unable to sleep.
Finally, remember that relaxation techniques (such as breathing exercises) are intended to help you relax. They aren’t intended to help you sleep. Also bear in mind that relaxation is a skill, that requires practice.
I hope this helps!
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