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Guided meditation, Body-Scan, Progressive relaxation... They are audio CDs / MP3 and you might find / buy them in the net.
Go out to the nature, go out with your friends, (if you have) play with your kids, read, disconnect your smart phone, go to gym...
Avoid big / heavy dinners (low carb, high protein), take lettuce / valerian infusions.
If nothing works, go to the doctor and take meds, but I would leave that for the last option.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
Unfortunately, getting drunk is not an option (religious restrictions).
But taking notes from everyone's, I went on climbing more or less 500 stairs to a public spot, watched sun rise, took coffee that my mom made me and slept (yeah my brain in wrongly wired ).
Point is, I managed to sleep for sometime and that's all I care right now
I cannot associate with the feeling. Although, in graduate school I'd pull 24hr days with little sleep between them, it was by design and with much caffeine. In real life, I'm a champion catnapper. Coffee does not keep me awake, either.
Realizing it's not an option for you, I'd just not that an alcoholic beverage in a quantity known as "a drink" will put me to sleep in ca. 1hr. (330ml beer, 110ml wine, 30ml single malt scotch). I do not bring this up idly: does your faith not allow exceptions for true medical need (perhaps with the approval of a respected religious figure)? I note this only in that, so far as it goes, the effect of alcohol on the body is basically harmless (assuming one isn't a heavy drinker/alcoholic) compared to the other medications. I know that religion often has its own whys and wherefores, but exceptions for true medical treatment are sometimes made - better for you then then the other sleep aids (although you may receive a 'no' because the others exist). This paragraph is rhetorical - no need for you to actually answer.
There are a lot of things to try, thankfully. One thing is to make sure you're not eating too close to when you're going to bed. Another is (as others have suggested) to get some exercise during the day, which is good for both stress and sleeping. Put bluelight filters on your screens (though I've heard this might not work) or eliminate screen time at least an hour before bed. You could try meditation, not everyone's thing, but it's an option: Before Sleep | Beginners Spoken Guided Meditation | Chakra Alignment |How to Chakra Balance - YouTube[^]. Make sure the bedroom is dark and cold. I've heard you should have warm feet, but I don't know if that's true.
If none of that works (or you could do it in tandem) consider going for a sleep study. You could have something like sleep apnea.
Everyone has there own method, nothing works for everyone and nothing works every time.
I've found a useful technique which have worked on most occasions.
First off make sure you have a good amount of water content, not hungry, not overly fed.
Make sure you don't have to go to the bathroom, cause you will have to just when you are about to doze off.
Eat a good 3 - 4 hours before sleep time.
Take a walk for 1 KM or at least 200 steps after dinner.
Try not to lie on mattress, use something like yoga mat or one of those expensive mattresses that are good for your back.
When lying on the bed, close your eyes think of all the different things that are coming to mind. Let the proverbial thoughts flow. Now paint all those thoughts on the (imaginary) canvas in front of you. And then paint everything white.
Once your head is clear along with a white background noise (I have found a sound with pattern relaxes me, like that of an old ceiling fan, one of those that look like they are about to fall off), or start counting one and two on inhale and exhale.
If you are spiritual by nature and Muslim try replacing one with Allah and two with Hoo, or YAH and WEH if you are a Christian.
Eat a healthy meal, drink water and go for a 30 minute walk. Listen to music while you do and don't really think about anything important.
It's important to let go of your stress and not hold onto it for days on end.
Developers often use stress as a motivator to get stuff done, but that's also super unhealthy.
My own appendix exploded because I did that too and I nearly died.
If you're still in your early 20's you should be fine though.