Lifelong insomniac here
Create and stick to a bedtime routine- just like when you were little. Having a bedtime routine primes the brain and body to let it change modes.
If you watch tv, turn it off an hour before bed, then start your bedtime routine.
Around an hour before turn down the lights.
If you need to use your phone or computer after sunset, use f.lux or some other blue light filter/software shifter.
Only thing in you do in your room should be changing, sleeping and sex.
Keep room cool, and as dark as possible.
Avoid caffeine after 4:00pm when possible.
Learn the 4,7,8 breath. YouTube it for instructions, practice twice daily. This is a big one for me on releasing tension throughout the day at at bedtime.
Consider picking up meditation. When I can't sleep I meditate until I fall asleep.
Racing mind- pick one thing that's worrying you, and dive into it. Try and solve it, give your mind closure and don't let it race.
This one sounds silly but works great. When getting into bed tell yourself something like "Good job brain, you kicked butt the past 16 hours- now you deserve a break, it's okay and time to rest. Anything besides sleep can wait til morning.
Create space during the day to be bored. Most people distract themselves from the moment the wake up until the moment they crawl back into bed. Leaves very little time for reflection and the brain nips at the chance to do so before ending the day. Give yourself time to process during the day, every day.
Get up at the same time, go to bed when your tired. This is the only thing that keeps me on a regular schedule. Going to bed before or after I'm tired results in a racing mind or unable to get up the next day. You'll be tired the first few days, and then settle into a nice natural rhythm.
After 30 min of not being able to sleep, get up and move to a dark room until your sleepy. I usually keep an audiobook or podcast handy for these times as getting on the phone, computer or watching tv is far too stimulating an activity.
Don't look at your alarm clock, or even have it visible. Your just asking for an anxiety attack.
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